22638931 has 12 divisors (see below), whose sum is σ = 27049008. Its totient is φ = 18878832.

The previous prime is 22638919. The next prime is 22638947. The reversal of 22638931 is 13983622.

It is a happy number.

It is not a de Polignac number, because 22638931 - 2¹³ = 22630739 is a prime.

It is a super-2 number, since 2×22638931² = 1025042393645522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22638971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4431 + ... + 8056.

It is an arithmetic number, because the mean of its divisors is an integer number (2254084).

Almost surely, 2^22638931 is an apocalyptic number.

22638931 is a deficient number, since it is larger than the sum of its proper divisors (4410077).

22638931 is a wasteful number, since it uses less digits than its factorization.

22638931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12538 (or 12531 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 22638931 is about 4758.0385664683. The cubic root of 22638931 is about 282.8906793480.

The spelling of 22638931 in words is "twenty-two million, six hundred thirty-eight thousand, nine hundred thirty-one".