1000 (number)

1000 (1,000, one thousand or thousand for short) 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
Roman numeralM
Binary11111010002
Ternary11010013
Quaternary332204
Quinary130005
Senary43446
Octal17508
Duodecimal6B412
Hexadecimal3E816
Vigesimal2A020
Base 36RS36

In Roman numerals, 1000 is written as M.

Examples of a thousand