365921 has 4 divisors (see below), whose sum is σ = 385200. Its totient is φ = 346644.

The previous prime is 365903. The next prime is 365929. The reversal of 365921 is 129563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-365921 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 365921.

It is not an unprimeable number, because it can be changed into a prime (365929) 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, 9611 + ... + 9648.

It is an arithmetic number, because the mean of its divisors is an integer number (96300).

2³⁶⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

365921 is a deficient number, since it is larger than the sum of its proper divisors (19279).

365921 is a wasteful number, since it uses less digits than its factorization.

365921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19278.

The product of its digits is 1620, while the sum is 26.

The square root of 365921 is about 604.9140434806. The cubic root of 365921 is about 71.5257540034.

The spelling of 365921 in words is "three hundred sixty-five thousand, nine hundred twenty-one".