18689136 has 20 divisors (see below), whose sum is σ = 48280392. Its totient is φ = 6229696.

The previous prime is 18689131. The next prime is 18689149. The reversal of 18689136 is 63198681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18689131) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 194631 + ... + 194726.

Almost surely, 2^18689136 is an apocalyptic number.

18689136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18689136 is an abundant number, since it is smaller than the sum of its proper divisors (29591256).

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

18689136 is a wasteful number, since it uses less digits than its factorization.

18689136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389368 (or 389362 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 18689136 is about 4323.0933369521. The cubic root of 18689136 is about 265.3768744709.

The spelling of 18689136 in words is "eighteen million, six hundred eighty-nine thousand, one hundred thirty-six".