18809812 has 12 divisors (see below), whose sum is σ = 37619680. Its totient is φ = 8061336.

The previous prime is 18809807. The next prime is 18809873. The reversal of 18809812 is 21890881.

18809812 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335862 + ... + 335917.

Almost surely, 2^18809812 is an apocalyptic number.

It is an amenable number.

18809812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18809812 is a wasteful number, since it uses less digits than its factorization.

18809812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671790 (or 671788 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 18809812 is about 4337.0280146663. The cubic root of 18809812 is about 265.9468301589.

The spelling of 18809812 in words is "eighteen million, eight hundred nine thousand, eight hundred twelve".