22638213 has 24 divisors (see below), whose sum is σ = 35442680. Its totient is φ = 13841280.

The previous prime is 22638211. The next prime is 22638227. The reversal of 22638213 is 31283622.

22638213 is a `hidden beast` number, since 2 + 2 + 638 + 21 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 567009 + 22071204 = 753^2 + 4698^2 .

It is not a de Polignac number, because 22638213 - 2¹ = 22638211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22638211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20643 + ... + 21711.

Almost surely, 2^22638213 is an apocalyptic number.

It is an amenable number.

22638213 is a deficient number, since it is larger than the sum of its proper divisors (12804467).

22638213 is a wasteful number, since it uses less digits than its factorization.

22638213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269 (or 1266 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 22638213 is about 4757.9631146111. The cubic root of 22638213 is about 282.8876886642.

The spelling of 22638213 in words is "twenty-two million, six hundred thirty-eight thousand, two hundred thirteen".