22638731 has 2 divisors, whose sum is σ = 22638732. Its totient is φ = 22638730.

The previous prime is 22638727. The next prime is 22638743. The reversal of 22638731 is 13783622.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22638731 - 2² = 22638727 is a prime.

It is a super-2 number, since 2×22638731² = 1025024282580722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22638761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11319365 + 11319366.

It is an arithmetic number, because the mean of its divisors is an integer number (11319366).

Almost surely, 2^22638731 is an apocalyptic number.

22638731 is a deficient number, since it is larger than the sum of its proper divisors (1).

22638731 is an equidigital number, since it uses as much as digits as its factorization.

22638731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 22638731 is about 4758.0175493581. The cubic root of 22638731 is about 282.8898462948.

The spelling of 22638731 in words is "twenty-two million, six hundred thirty-eight thousand, seven hundred thirty-one".