# 1000 (number)

 List of numbers — Integers << 1k 2k 3k 4k 5k 6k 7k 8k 9k >>
Cardinal One thousand
Ordinal 1000th
Factorization [itex]2^3 \cdot 5^3[itex]
Roman numeral M (mille)
Unicode representation of Roman numeral Ⅿ, ⅿ, ↀ
prefixes chilia- (from Greek)

milli- (from Latin)

Binary 1111101000

1000 is the natural number following 999 and preceding 1001.

In scientific notation, one thousand is written as 103. The SI prefix for a thousand is "kilo-".

Thousand (single) is a techno single by Moby.

 Contents

## Selected numbers in the thousands (1001-1999)

### 1001-1249

1001 - sphenic number, pentagonal number, pentatope number
1002 - sphenic number, Mertens function zero
1005 - Mertens function zero
1008 - divisible by the number of primes below it
1010 - Mertens function zero
1013 - Sophie Germain prime, centered square number, Mertens function zero
1014 - Mertens function zero
1015 - square pyramidal number
1018 - Mertens function zero
1019 - Sophie Germain prime, safe prime
1023 - is the highest number one can count to on one's fingers using binary
1024 - power of two, 32^2; in common use, the amount of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted)
1027 - sum of the squares of the first eight primes
1031 - Sophie Germain prime
1035 - triangular number, hexagonal number
1049 - Sophie Germain prime, highly cototient number
1051 - centered pentagonal number
1056 - pronic number
1060 - sum of the first 25 primes
1071 - heptagonal number
1072 - centered heptagonal number
1079 - Every positive integer is the sum of at most 1079 tenth powers.
1080 - pentagonal number
1081 - triangular number
1086 - Smith number
1089 - 33^2, nonagonal number, centered octagonal number
1092- divisible by the number of primes below it
1093 - star number
1103 - Sophie Germain prime
1104 - Keith number
1105 - Carmichael number, magic constant of n × n magic square and n-Queens Problem for n = 13, decagonal number, centered square number
1116 - divisible by the number of primes below it
1122 - pronic number, divisible by the number of primes below it
1128 - triangular number, hexagonal number, divisible by the number of primes below it
1134- divisible by the number of primes below it
1138 - special code for Easter eggs on Star Wars DVDs, because of George Lucas's movie THX-1138
1140 - tetrahedral number
1152 - highly totient number
1156 - 34^2, octahedral number, centered pentagonal number
1161 - sum of the first 26 primes
1162 - pentagonal number
1169 - highly cototient number
1176 - triangular number
1177 - heptagonal number
1184 - amicable number with 1210
1187 - safe prime
1190 - pronic number
1198 - centered heptagonal number
1201 - centered square number
1210 - amicable number with 1184
1216 - nonagonal number
1219 - Mertens function zero
1220 - Mertens function zero
1223 - Sophie Germain prime
1225 - triangular number, 35^2, triangular square number, hexagonal number, centered octagonal number
1229 - Sophie Germain prime
1233 - 12^2 + 33^2
1240 - square pyramidal number
1241 - centered cube number
1242 - decagonal number
1247 - pentagonal number

### 1250-1499

1255 - Mertens function zero
1256 - Mertens function zero
1258 - Mertens function zero
1259 - highly cototient number
1260 - highly composite number, pronic number, vampire number
1261 - star number, Mertens function zero
1264 - sum of the first 27 primes
1266 - centered pentagonal number, Mertens function zero
1270 - Mertens function zero
1279 - Mertens function zero
1280 - Mertens function zero
1282 - Mertens function zero
1283 - safe prime
1285 - Mertens function zero
1288 - heptagonal number
1289 - Sophie Germain prime, Mertens function zero
1291 - Mertens function zero
1292 - Mertens function zero
1296 - 36^2, fourth power of 6, sum of the cubes of the first eight positive integers
1297 - Mertens function zero
1299 - Mertens function zero
1300 - Mertens function zero
1301 - centered square number
1302 - Mertens function zero
1306 - Mertens function zero
1307 - safe prime
1318 - Mertens function zero
1319 - safe prime
1326 - triangular number, hexagonal number, Mertens function zero
1329 - Mertens function zero
1330 - tetrahedral number
1331 - cube of 11, centered heptagonal number
1332 - pronic number
1335 - pentagonal number, Mertens function zero
1336 - Mertens function zero
1337 - Used in the novel form of spelling called leet
1338 - Mertens function zero
1342 - Mertens function zero
1350 - nonagonal number
1365 - pentatope number
1367 - safe prime
1369 - 37^2, centered octagonal number
1371 - sum of the first 28 primes
1378 - triangular number
1379 - magic constant of n × n magic square and n-Queens Problem for n = 14.
1381 - centered pentagonal number
1387 - super-Poulet number, decagonal number
1395 - vampire number
1404 - heptagonal number
1405 = 26^2 + 27^2 = 7^2 + 8^2 + ... + 16^2, centered square number
1406 - pronic number, semi-meandric number
1409 - Sophie Germain prime
1419 - Zeisel number
1425 - self-descriptive number in base 5
1426 - pentagonal number
1431 - triangular number, hexagonal number
1435 - vampire number; the standard railway gauge in millimetres, equivalent to 4' 81"
1439 - Sophie Germain prime, safe prime
1440 - a highly totient number, square pyramidal number and a 481-gonal number. Also, the number of minutes in one day, and the blocksize of a standard 3,5" floppy disk
1441 - star number
1444 - 38^2, smallest pandigital number in Roman numerals
1451 - Sophie Germain prime
1469 - octahedral number, highly cototient number
1470 - pentagonal pyramidal number
1471 - centered heptagonal number
1480 - sum of the first 29 primes
1481 - Sophie Germain prime
1482 - pronic number
1485 - triangular number
1487 - safe prime
1490 - tetranacci number
1491 - nonagonal number, Mertens function zero
1492 - Mertens function zero
1496 - square pyramidal number
1499 - Sophie Germain prime

### 1500-1749

1501 - centered pentagonal number
1511 - Sophie Germain prime
1513 - centered square number
1518 - Mertens function zero
1519 - Mertens function zero
1520 - pentagonal number, Mertens function zero
1521 - Mertens function zero, 39^2, centered octagonal number
1523 - Mertens function zero, safe prime
1524 - Mertens function zero
1525 - heptagonal number, Mertens function zero
1527 - Mertens function zero
1528 - Mertens function zero
1530 - vampire number
1531 - Mertens function zero
1532 - Mertens function zero
1537 - Keith number, Mertens function zero
1540 - triangular number, hexagonal number, decagonal number, tetrahedral number
1543 - Mertens function zero
1544 - Mertens function zero
1546 - Mertens function zero
1556 - sum of the squares of the first nine primes
1559 - Sophie Germain prime
1560 - pronic number
1575 - odd abundant number
1583 - Sophie Germain prime
1593 - sum of the first 30 primes
1596 - triangular number
1597 - Fibonacci number
1600 - 40^2, street number on Pennsylvania avenue of the White House, perfect score on SAT tests administered prior to 2005
1601 - Sophie Germain prime, the novel 1601 (Mark Twain)
1616 - the year Shakespeare died
1617 - pentagonal number
1618 - centered heptagonal number
1619 - safe prime
1625 - centered square number
1626 - centered pentagonal number
1633 - star number
1638 - harmonic divisor number
1639 - nonagonal number
1640 - pronic number
1649 - highly cototient number
1651 - heptagonal number
1653 - triangular number, hexagonal number
1657 - cuban prime
1666 - largest efficient pandigital number in Roman numerals (each symbol occurs exactly once)
1679 - highly cototient number
1680 - highly composite number
1681 - 41^2, smallest number yielded by the formula n^2 + n + 41 that is not a prime; centered octagonal number
1695 - magic constant of n × n magic square and n-Queens Problem for n = 15.
1701 - decagonal number, hull number of the Starship Enterprise on Star Trek
1705 - tribonacci number
1711 - triangular number
1717 - pentagonal number
1720 - sum of the first 31 primes
1722 - Giuga number, pronic number
1728 - cube of 12 and so is the number of cubic inches in a cubic foot
1729 - taxicab number, Carmichael number, Zeisel number, centered cube number. In the decimal expansion of e the first time all 10 digits appear in sequence starts at the 1729th decimal place. In 1979 the rock musical Hair closed on Broadway in New York City after 1729 performances.
1733 - Sophie Germain prime
1741 - centered square number

### 1750-1999

1756 - centered pentagonal number
1764 - 42^2
1770 - triangular number, hexagonal number, Town of Seventeen Seventy in Australia
1771 - tetrahedral number
1772 - centered heptagonal number
1782 - heptagonal number
1785 - square pyramidal number
1791 - largest natural number that cannot be expressed as a sum of at most four hexagonal numbers.
1794 - nonagonal number
1800 - pentagonal pyramidal number, also, in da Ponte's Don Giovanni, the number of women Don Giovanni had slept with so far when confronted by Donna Elvira, according to Leporello's tally
1801 - cuban prime
1806 - pronic number
1811 - Sophie Germain prime
1820 - pentagonal number, pentatope number
1823 - safe prime
1827 - vampire number
1828 - meandric number, open meandric number
1830 - triangular number
1834 - octahedral number, sum of the cubes of the first five primes
1836 - factor by which a proton is more massive than an electron
1837 - star number
1841 - Mertens function zero
1843 - Mertens function zero
1844 - Mertens function zero
1845 - Mertens function zero
1849 - 43^2, centered octagonal number
1851 - sum of the first 32 primes
1853 - Mertens function zero
1854 - Mertens function zero
1857 - Mertens function zero
1861 - centered square number, Mertens function zero
1862 - Mertens function zero
1863 - Mertens function zero
1864 - Mertens function zero
1866 - Mertens function zero
1870 - decagonal number
1885 - Zeisel number
1889 - Sophie Germain prime, highly cototient number
1891 - triangular number, hexagonal number, centered pentagonal number
1892 - pronic number
1900 - 1900 or Novecento is a 1977 movie
1901 - Sophie Germain prime
1907 - safe prime
1918 - heptagonal number
1926 - pentagonal number
1929 - Mertens function zero
1931 - Sophie Germain prime
1933 - centered heptagonal number
1936 - 44^2
1938 - Mertens function zero
1951 - cuban prime
1953 - triangular number
1956 - nonagonal number
1969 - the movie 1969 (movie)
1973 - Sophie Germain prime
1980 - pronic number
1984 - see 1984 (number)
1985 - centered square number
1988 - sum of the first 33 primesda:Tusind

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