18713812 has 24 divisors (see below), whose sum is σ = 36804096. Its totient is φ = 8261088.

The previous prime is 18713791. The next prime is 18713813. The reversal of 18713812 is 21831781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6628 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (1533504).

Almost surely, 2^18713812 is an apocalyptic number.

It is an amenable number.

18713812 is a deficient number, since it is larger than the sum of its proper divisors (18090284).

18713812 is a wasteful number, since it uses less digits than its factorization.

18713812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15687 (or 15685 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 18713812 is about 4325.9463704489. The cubic root of 18713812 is about 265.4936189405.

The spelling of 18713812 in words is "eighteen million, seven hundred thirteen thousand, eight hundred twelve".