22991865 has 32 divisors (see below), whose sum is σ = 39922176. Its totient is φ = 11232000.

The previous prime is 22991849. The next prime is 22991869. The reversal of 22991865 is 56819922.

It is not a de Polignac number, because 22991865 - 2⁴ = 22991849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22991869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30240 + ... + 30990.

It is an arithmetic number, because the mean of its divisors is an integer number (1247568).

Almost surely, 2^22991865 is an apocalyptic number.

It is an amenable number.

22991865 is a deficient number, since it is larger than the sum of its proper divisors (16930311).

22991865 is a wasteful number, since it uses less digits than its factorization.

22991865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its digits is 77760, while the sum is 42.

The square root of 22991865 is about 4794.9833159251. The cubic root of 22991865 is about 284.3531652518.

The spelling of 22991865 in words is "twenty-two million, nine hundred ninety-one thousand, eight hundred sixty-five".