22636639 has 4 divisors (see below), whose sum is σ = 23968224. Its totient is φ = 21305056.

The previous prime is 22636631. The next prime is 22636661. The reversal of 22636639 is 93663622.

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

It is a cyclic number.

It is not a de Polignac number, because 22636639 - 2³ = 22636631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22636598 and 22636607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22636631) 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, 665767 + ... + 665800.

It is an arithmetic number, because the mean of its divisors is an integer number (5992056).

Almost surely, 2^22636639 is an apocalyptic number.

22636639 is a deficient number, since it is larger than the sum of its proper divisors (1331585).

22636639 is a wasteful number, since it uses less digits than its factorization.

22636639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331584.

The product of its digits is 69984, while the sum is 37.

The square root of 22636639 is about 4757.7977048210. The cubic root of 22636639 is about 282.8811322641.

The spelling of 22636639 in words is "twenty-two million, six hundred thirty-six thousand, six hundred thirty-nine".