Number reference
1000 explained.
1000: one thousand, composite, power of ten; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- one thousand
- Classification
- composite
- Factors
- 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000
- Prime factorization
- 2 × 2 × 2 × 5 × 5 × 5
- Square root
- 31.622777
- Cube root
- 10
- Binary
- 1111101000
- Octal
- 1750
- Hexadecimal
- 3E8
- Roman numeral
- M
- Digit sum
- 1
- Digital root
- 1
What makes 1000 notable
- Power of ten. 1000 = 10^3, so shifting a decimal point by 3 places multiplies or divides by it.
- Perfect cube. 1000 = 10³, so a cube of edge 10 has a volume of 1000.
1000 in everyday use
One thousand is the "kilo" step in the metric system: a kilogram is a thousand grams, a kilometre a thousand metres. It is also the base of scientific notation grouping in most engineering work.
Nearby numbers
How to read this page
The factor list shows every way 1000 splits into equal whole-number groups — 16 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 1000 for contexts that do not use decimal.
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