365665 has 4 divisors (see below), whose sum is σ = 438804. Its totient is φ = 292528.

The previous prime is 365641. The next prime is 365669. The reversal of 365665 is 566563.

It is a happy number.

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 208849 + 156816 = 457^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 365665 - 2⁷ = 365537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (365669) 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, 36562 + ... + 36571.

It is an arithmetic number, because the mean of its divisors is an integer number (109701).

2³⁶⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

365665 is a deficient number, since it is larger than the sum of its proper divisors (73139).

365665 is an equidigital number, since it uses as much as digits as its factorization.

365665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73138.

The product of its digits is 16200, while the sum is 31.

The square root of 365665 is about 604.7024061470. The cubic root of 365665 is about 71.5090701976.

It can be divided in two parts, 3656 and 65, that added together give a square (3721 = 61²).

The spelling of 365665 in words is "three hundred sixty-five thousand, six hundred sixty-five".