18159804 has 36 divisors (see below), whose sum is σ = 49436296. Its totient is φ = 5587488.

The previous prime is 18159797. The next prime is 18159833. The reversal of 18159804 is 40895181.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 18934 + ... + 19869.

Almost surely, 2^18159804 is an apocalyptic number.

It is an amenable number.

18159804 is an abundant number, since it is smaller than the sum of its proper divisors (31276492).

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

18159804 is a wasteful number, since it uses less digits than its factorization.

18159804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38826 (or 38821 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18159804 is about 4261.4321536310. The cubic root of 18159804 is about 262.8474202566.

The spelling of 18159804 in words is "eighteen million, one hundred fifty-nine thousand, eight hundred four".