18436904 has 16 divisors (see below), whose sum is σ = 34751220. Its totient is φ = 9169920.

The previous prime is 18436903. The next prime is 18436919. The reversal of 18436904 is 40963481.

It can be written as a sum of positive squares in 2 ways, for example, as 17222500 + 1214404 = 4150^2 + 1102^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18436903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4427 + ... + 7514.

Almost surely, 2^18436904 is an apocalyptic number.

It is an amenable number.

18436904 is a deficient number, since it is larger than the sum of its proper divisors (16314316).

18436904 is a wasteful number, since it uses less digits than its factorization.

18436904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12140 (or 12136 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18436904 is about 4293.8216078454. The cubic root of 18436904 is about 264.1776047023.

The spelling of 18436904 in words is "eighteen million, four hundred thirty-six thousand, nine hundred four".