18439804 has 12 divisors (see below), whose sum is σ = 33968200. Its totient is φ = 8734608.

The previous prime is 18439787. The next prime is 18439829. The reversal of 18439804 is 40893481.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 121239 + ... + 121390.

Almost surely, 2^18439804 is an apocalyptic number.

It is an amenable number.

18439804 is a deficient number, since it is larger than the sum of its proper divisors (15528396).

18439804 is a wasteful number, since it uses less digits than its factorization.

18439804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242652 (or 242650 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18439804 is about 4294.1592890809. The cubic root of 18439804 is about 264.1914550915.

The spelling of 18439804 in words is "eighteen million, four hundred thirty-nine thousand, eight hundred four".