365 (number)

Template:Infobox number 365 (three hundred [and] sixty-five) is the natural number following 364 and preceding 366.

Mathematics

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

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

$365=13^2+14^2$

$365=10^2+11^2+12^2$

Timekeeping

There are 365.2422 solar days in the mean tropical year. Several solar calendars have a year containing 365 days. Related to this, in Ontario, the driver's license learner's permit used to be called "365" because it was valid for only 366 days. Financial and scientific calculations often use a 365-day calendar to simplify daily rates.