22638637 has 6 divisors (see below), whose sum is σ = 26334798. Its totient is φ = 19404504.

The previous prime is 22638617. The next prime is 22638643. The reversal of 22638637 is 73683622.

It can be written as a sum of positive squares in only one way, i.e., 18714276 + 3924361 = 4326^2 + 1981^2 .

It is not a de Polignac number, because 22638637 - 2¹⁹ = 22114349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22638596 and 22638605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22638617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 230958 + ... + 231055.

It is an arithmetic number, because the mean of its divisors is an integer number (4389133).

Almost surely, 2^22638637 is an apocalyptic number.

It is an amenable number.

22638637 is a deficient number, since it is larger than the sum of its proper divisors (3696161).

22638637 is an equidigital number, since it uses as much as digits as its factorization.

22638637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462027 (or 462020 counting only the distinct ones).

The product of its digits is 72576, while the sum is 37.

The square root of 22638637 is about 4758.0076712843. The cubic root of 22638637 is about 282.8894547581.

The spelling of 22638637 in words is "twenty-two million, six hundred thirty-eight thousand, six hundred thirty-seven".