18636904 has 48 divisors (see below), whose sum is σ = 41392260. Its totient is φ = 7814400.

The previous prime is 18636899. The next prime is 18636907. The reversal of 18636904 is 40963681.

It can be written as a sum of positive squares in 2 ways, for example, as 17656804 + 980100 = 4202^2 + 990^2 .

It is not an unprimeable number, because it can be changed into a prime (18636907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11844 + ... + 13324.

Almost surely, 2^18636904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18636904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20696130).

18636904 is an abundant number, since it is smaller than the sum of its proper divisors (22755356).

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

18636904 is a wasteful number, since it uses less digits than its factorization.

18636904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 18636904 is about 4317.0480655188. The cubic root of 18636904 is about 265.1294205854.

The spelling of 18636904 in words is "eighteen million, six hundred thirty-six thousand, nine hundred four".