22638981 has 4 divisors (see below), whose sum is σ = 30185312. Its totient is φ = 15092652.

The previous prime is 22638971. The next prime is 22639031. The reversal of 22638981 is 18983622.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22638981 - 2⁷ = 22638853 is a prime.

It is a super-2 number, since 2×22638981² = 1025046921436722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3773161 + ... + 3773166.

It is an arithmetic number, because the mean of its divisors is an integer number (7546328).

Almost surely, 2^22638981 is an apocalyptic number.

It is an amenable number.

22638981 is a deficient number, since it is larger than the sum of its proper divisors (7546331).

22638981 is an equidigital number, since it uses as much as digits as its factorization.

22638981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7546330.

The product of its digits is 41472, while the sum is 39.

The square root of 22638981 is about 4758.0438207314. The cubic root of 22638981 is about 282.8908876105.

The spelling of 22638981 in words is "twenty-two million, six hundred thirty-eight thousand, nine hundred eighty-one".