18316812 has 12 divisors (see below), whose sum is σ = 42739256. Its totient is φ = 6105600.

The previous prime is 18316807. The next prime is 18316819. The reversal of 18316812 is 21861381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 18316812.

It is not an unprimeable number, because it can be changed into a prime (18316819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763189 + ... + 763212.

Almost surely, 2^18316812 is an apocalyptic number.

18316812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18316812 is an abundant number, since it is smaller than the sum of its proper divisors (24422444).

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

18316812 is a wasteful number, since it uses less digits than its factorization.

18316812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526408 (or 1526406 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 18316812 is about 4279.8144819606. The cubic root of 18316812 is about 263.6027657685.

The spelling of 18316812 in words is "eighteen million, three hundred sixteen thousand, eight hundred twelve".