22918538 has 4 divisors (see below), whose sum is σ = 34377810. Its totient is φ = 11459268.

The previous prime is 22918537. The next prime is 22918543. The reversal of 22918538 is 83581922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 9690769 = 3637^2 + 3113^2 .

It is not an unprimeable number, because it can be changed into a prime (22918537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5729633 + ... + 5729636.

Almost surely, 2^22918538 is an apocalyptic number.

22918538 is a deficient number, since it is larger than the sum of its proper divisors (11459272).

22918538 is a wasteful number, since it uses less digits than its factorization.

22918538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459271.

The product of its digits is 34560, while the sum is 38.

The square root of 22918538 is about 4787.3309891838. The cubic root of 22918538 is about 284.0505514061.

The spelling of 22918538 in words is "twenty-two million, nine hundred eighteen thousand, five hundred thirty-eight".