18404004 has 36 divisors (see below), whose sum is σ = 43656144. Its totient is φ = 6034176.

The previous prime is 18403999. The next prime is 18404021. The reversal of 18404004 is 40040481.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112827 + ... + 112989.

Almost surely, 2^18404004 is an apocalyptic number.

It is an amenable number.

18404004 is an abundant number, since it is smaller than the sum of its proper divisors (25252140).

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

18404004 is a wasteful number, since it uses less digits than its factorization.

18404004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 18404004 is about 4289.9888111742. The cubic root of 18404004 is about 264.0203726243.

Adding to 18404004 its reverse (40040481), we get a palindrome (58444485).

The spelling of 18404004 in words is "eighteen million, four hundred four thousand, four".