18904808 has 16 divisors (see below), whose sum is σ = 38173380. Its totient is φ = 8725248.

The previous prime is 18904807. The next prime is 18904819. The reversal of 18904808 is 80840981.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 1582564 = 4162^2 + 1258^2 .

It is not an unprimeable number, because it can be changed into a prime (18904807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90785 + ... + 90992.

Almost surely, 2^18904808 is an apocalyptic number.

It is an amenable number.

18904808 is an abundant number, since it is smaller than the sum of its proper divisors (19268572).

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

18904808 is a wasteful number, since it uses less digits than its factorization.

18904808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181796 (or 181792 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18904808 is about 4347.9659612283. The cubic root of 18904808 is about 266.3937861338.

The spelling of 18904808 in words is "eighteen million, nine hundred four thousand, eight hundred eight".