18581812 has 12 divisors (see below), whose sum is σ = 32598720. Its totient is φ = 9267896.

The previous prime is 18581777. The next prime is 18581813. The reversal of 18581812 is 21818581.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18581813) 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, 3868 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (2716560).

Almost surely, 2^18581812 is an apocalyptic number.

It is an amenable number.

18581812 is a deficient number, since it is larger than the sum of its proper divisors (14016908).

18581812 is a wasteful number, since it uses less digits than its factorization.

18581812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510 (or 11508 counting only the distinct ones).

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

The square root of 18581812 is about 4310.6625940799. The cubic root of 18581812 is about 264.8679156640.

The spelling of 18581812 in words is "eighteen million, five hundred eighty-one thousand, eight hundred twelve".