365 (number)

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Cardinal	365 three hundred [and] sixty-five
Ordinal	365th three hundred [and] sixty-fifth
Factorization	<math> 5 \cdot 73 <math>
Divisors	5, 73
Roman numeral	CCCLXV
Prefixes	triacosiakaihexacontakaipenta- (Greek)
Binary	101101101
Octal	555
Duodecimal	265
Hexadecimal	16D

365 is a semiprime centered square number. It is also the fifth 38-gonal number.

It is the smallest number which has more than one expression as a sum of consecutive square numbers:

<math>365<math>	<math> = 13^2 + 14^2<math>
	<math> = 10^2 + 11^2 + 12^2<math>

Timekeeping

There are 365.2422 solar days in the mean tropical year. Several varieties of calendar have resulted from attempts to divide the tropical year into 29.5-day lunar months and traditional 7-day weeks.