22639957 has 4 divisors (see below), whose sum is σ = 23067180. Its totient is φ = 22212736.

The previous prime is 22639943. The next prime is 22639961. The reversal of 22639957 is 75993622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75993622 = 2 ⋅37996811.

It can be written as a sum of positive squares in 2 ways, for example, as 10536516 + 12103441 = 3246^2 + 3479^2 .

It is a cyclic number.

It is not a de Polignac number, because 22639957 - 2¹⁹ = 22115669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22639987) 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, 213532 + ... + 213637.

It is an arithmetic number, because the mean of its divisors is an integer number (5766795).

Almost surely, 2^22639957 is an apocalyptic number.

It is an amenable number.

22639957 is a deficient number, since it is larger than the sum of its proper divisors (427223).

22639957 is an equidigital number, since it uses as much as digits as its factorization.

22639957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427222.

The product of its digits is 204120, while the sum is 43.

The square root of 22639957 is about 4758.1463827840. The cubic root of 22639957 is about 282.8949528338.

The spelling of 22639957 in words is "twenty-two million, six hundred thirty-nine thousand, nine hundred fifty-seven".