22918638 has 8 divisors (see below), whose sum is σ = 45837288. Its totient is φ = 7639544.

The previous prime is 22918619. The next prime is 22918639. The reversal of 22918638 is 83681922.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

22918638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 22918596 and 22918605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22918639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1909881 + ... + 1909892.

It is an arithmetic number, because the mean of its divisors is an integer number (5729661).

Almost surely, 2^22918638 is an apocalyptic number.

22918638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22918638 is a wasteful number, since it uses less digits than its factorization.

22918638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819778.

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

The square root of 22918638 is about 4787.3414334054. The cubic root of 22918638 is about 284.0509645362.

The spelling of 22918638 in words is "twenty-two million, nine hundred eighteen thousand, six hundred thirty-eight".