22638231 has 32 divisors (see below), whose sum is σ = 41817600. Its totient is φ = 11759040.

The previous prime is 22638229. The next prime is 22638257. The reversal of 22638231 is 13283622.

22638231 is a `hidden beast` number, since 2 + 2 + 638 + 23 + 1 = 666.

It is not a de Polignac number, because 22638231 - 2¹ = 22638229 is a prime.

It is a super-2 number, since 2×22638231² = 1024979005618722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22638195 and 22638204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22638211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3366 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (1306800).

Almost surely, 2^22638231 is an apocalyptic number.

22638231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22638231 is a deficient number, since it is larger than the sum of its proper divisors (19179369).

22638231 is a wasteful number, since it uses less digits than its factorization.

22638231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916 (or 10910 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 22638231 is about 4757.9650061765. The cubic root of 22638231 is about 282.8877636403.

The spelling of 22638231 in words is "twenty-two million, six hundred thirty-eight thousand, two hundred thirty-one".