Number reference
365 explained.
365: three hundred sixty-five, composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- three hundred sixty-five
- Classification
- composite
- Factors
- 1, 5, 73, 365
- Prime factorization
- 5 × 73
- Square root
- 19.104973
- Cube root
- 7.146569
- Binary
- 101101101
- Octal
- 555
- Hexadecimal
- 16D
- Roman numeral
- CCCLXV
- Digit sum
- 14
- Digital root
- 5
What makes 365 notable
- Semiprime. 365 = 5 × 73, a product of exactly two primes. That gives it just four divisors, so it splits into equal groups in only two non-trivial ways.
365 in everyday use
Three hundred sixty-five is the number of days in a common Gregorian year. The extra quarter-day per orbit is why a leap day is added every fourth year, with century exceptions.
Nearby numbers
How to read this page
The factor list shows every way 365 splits into equal whole-number groups — 4 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 365 for contexts that do not use decimal.
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