365881 has 4 divisors (see below), whose sum is σ = 367092. Its totient is φ = 364672.

The previous prime is 365851. The next prime is 365903. The reversal of 365881 is 188563.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 95481 + 270400 = 309^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 365881 - 2⁹ = 365369 is a prime.

It is a super-2 number, since 2×365881² = 267737812322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (365851) 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, 285 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (91773).

2³⁶⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

365881 is a deficient number, since it is larger than the sum of its proper divisors (1211).

365881 is an equidigital number, since it uses as much as digits as its factorization.

365881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210.

The product of its digits is 5760, while the sum is 31.

The square root of 365881 is about 604.8809800283. The cubic root of 365881 is about 71.5231476718.

The spelling of 365881 in words is "three hundred sixty-five thousand, eight hundred eighty-one".