365 has 4 divisors (see below), whose sum is σ = 444. Its totient is φ = 288.

The previous prime is 359. The next prime is 367. The reversal of 365 is 563.

365 = 10² + 11² + 12².

It is a happy number.

365 is nontrivially palindromic in base 2, base 8 and base 14.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169 + 196 = 13^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 365 - 2⁴ = 349 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

365 is an undulating number in base 14.

365 is a nontrivial repdigit in base 8.

It is a plaindrome in base 3, base 8, base 9 and base 16.

It is a nialpdrome in base 8 and base 13.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32 + ... + 41.

It is an arithmetic number, because the mean of its divisors is an integer number (111).

365 is the 14-th centered square number.

It is an amenable number.

365 is a deficient number, since it is larger than the sum of its proper divisors (79).

365 is an equidigital number, since it uses as much as digits as its factorization.

365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78.

The product of its digits is 90, while the sum is 14.

The square root of 365 is about 19.1049731745. The cubic root of 365 is about 7.1465694988.

Subtracting from 365 its sum of digits (14), we obtain a triangular number (351 = T₂₆).

The spelling of 365 in words is "three hundred sixty-five", and thus it is an aban number and an oban number.