18087804 has 36 divisors (see below), whose sum is σ = 52254384. Its totient is φ = 5167872.

The previous prime is 18087757. The next prime is 18087827. The reversal of 18087804 is 40878081.

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

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

18087804 is a modest number, since divided by 87804 gives 180 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35637 + ... + 36140.

Almost surely, 2^18087804 is an apocalyptic number.

18087804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18087804 is an abundant number, since it is smaller than the sum of its proper divisors (34166580).

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

18087804 is a wasteful number, since it uses less digits than its factorization.

18087804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71794 (or 71789 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18087804 is about 4252.9758992969. The cubic root of 18087804 is about 262.4995809517.

The spelling of 18087804 in words is "eighteen million, eighty-seven thousand, eight hundred four".