Number reference
12 explained.
12: twelve, composite, highly composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- twelve
- Classification
- composite
- Factors
- 1, 2, 3, 4, 6, 12
- Prime factorization
- 2 × 2 × 3
- Square root
- 3.464102
- Cube root
- 2.289428
- Binary
- 1100
- Octal
- 14
- Hexadecimal
- C
- Roman numeral
- XII
- Digit sum
- 3
- Digital root
- 3
What makes 12 notable
- Highly composite. 12 has 6 divisors — more than any smaller positive number. That is why numbers like this get chosen for units of time, angle, and packaging.
12 in everyday use
Twelve is the number of months in a year and the count in a dozen. Trade favoured it over ten because it divides evenly by 2, 3, 4, and 6, which makes splitting a batch straightforward.
Nearby numbers
How to read this page
The factor list shows every way 12 splits into equal whole-number groups — 6 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 12 for contexts that do not use decimal.
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