36865921 has 4 divisors (see below), whose sum is σ = 37723312. Its totient is φ = 36008532.

The previous prime is 36865891. The next prime is 36865943. The reversal of 36865921 is 12956863.

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 not a de Polignac number, because 36865921 - 2¹¹ = 36863873 is a prime.

It is a super-2 number, since 2×36865921² = 2718192262356482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36865951) 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, 428631 + ... + 428716.

It is an arithmetic number, because the mean of its divisors is an integer number (9430828).

Almost surely, 2^36865921 is an apocalyptic number.

It is an amenable number.

36865921 is a deficient number, since it is larger than the sum of its proper divisors (857391).

36865921 is an equidigital number, since it uses as much as digits as its factorization.

36865921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857390.

The product of its digits is 77760, while the sum is 40.

The square root of 36865921 is about 6071.7313016964. The cubic root of 36865921 is about 332.8191926079.

The spelling of 36865921 in words is "thirty-six million, eight hundred sixty-five thousand, nine hundred twenty-one".