18904868 has 12 divisors (see below), whose sum is σ = 34224540. Its totient is φ = 9126432.

The previous prime is 18904859. The next prime is 18904871. The reversal of 18904868 is 86840981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14992384 + 3912484 = 3872^2 + 1978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81371 + ... + 81602.

It is an arithmetic number, because the mean of its divisors is an integer number (2852045).

Almost surely, 2^18904868 is an apocalyptic number.

It is an amenable number.

18904868 is a deficient number, since it is larger than the sum of its proper divisors (15319672).

18904868 is a wasteful number, since it uses less digits than its factorization.

18904868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163006 (or 163004 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18904868 is about 4347.9728610009. The cubic root of 18904868 is about 266.3940679600.

The spelling of 18904868 in words is "eighteen million, nine hundred four thousand, eight hundred sixty-eight".