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A thousand (1000, one thousand or 1,000) is the natural number after 999 and before 1001. One thousand thousands is known as a million.

← 999 1000 1001 →
Cardinalone thousand
Ordinal1000th
(one thousandth)
Factorization23× 53
Greek numeral,Α´
Roman numeralM
Binary11111010002
Ternary11010013
Quaternary332204
Quinary130005
Senary43446
Octal17508
Duodecimal6B412
Hexadecimal3E816
Vigesimal2A020
Base 36RS36

In Roman numerals, 1000 is written as M.

Examples of a thousandEdit