18855812 has 12 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 9123720.

The previous prime is 18855797. The next prime is 18855821. The reversal of 18855812 is 21855881.

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, 75908 + ... + 76155.

It is an arithmetic number, because the mean of its divisors is an integer number (2838528).

Almost surely, 2^18855812 is an apocalyptic number.

It is an amenable number.

18855812 is a deficient number, since it is larger than the sum of its proper divisors (15206524).

18855812 is a wasteful number, since it uses less digits than its factorization.

18855812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152098 (or 152096 counting only the distinct ones).

The product of its digits is 25600, while the sum is 38.

The square root of 18855812 is about 4342.3279470809. The cubic root of 18855812 is about 266.1634475144.

The spelling of 18855812 in words is "eighteen million, eight hundred fifty-five thousand, eight hundred twelve".