18518812 has 24 divisors (see below), whose sum is σ = 35079296. Its totient is φ = 8503488.

The previous prime is 18518809. The next prime is 18518813. The reversal of 18518812 is 21881581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518813) 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 7 ways as a sum of consecutive naturals, for example, 10798 + ... + 12394.

Almost surely, 2^18518812 is an apocalyptic number.

It is an amenable number.

18518812 is a deficient number, since it is larger than the sum of its proper divisors (16560484).

18518812 is a wasteful number, since it uses less digits than its factorization.

18518812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837 (or 1835 counting only the distinct ones).

The product of its digits is 5120, while the sum is 34.

The square root of 18518812 is about 4303.3489284510. The cubic root of 18518812 is about 264.5682396058.

The spelling of 18518812 in words is "eighteen million, five hundred eighteen thousand, eight hundred twelve".