18839904 has 36 divisors (see below), whose sum is σ = 49566636. Its totient is φ = 6265792.

The previous prime is 18839867. The next prime is 18839917. The reversal of 18839904 is 40993881.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 42307 + ... + 42749.

It is an arithmetic number, because the mean of its divisors is an integer number (1376851).

Almost surely, 2^18839904 is an apocalyptic number.

It is an amenable number.

18839904 is an abundant number, since it is smaller than the sum of its proper divisors (30726732).

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

18839904 is an frugal number, since it uses more digits than its factorization.

18839904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18839904 is about 4340.4958242118. The cubic root of 18839904 is about 266.0885754730.

The spelling of 18839904 in words is "eighteen million, eight hundred thirty-nine thousand, nine hundred four".