18319812 has 48 divisors (see below), whose sum is σ = 51730560. Its totient is φ = 4925952.

The previous prime is 18319811. The next prime is 18319817. The reversal of 18319812 is 21891381.

It is not an unprimeable number, because it can be changed into a prime (18319811) 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 15 ways as a sum of consecutive naturals, for example, 4987 + ... + 7842.

It is an arithmetic number, because the mean of its divisors is an integer number (1077720).

Almost surely, 2^18319812 is an apocalyptic number.

18319812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18319812 is an abundant number, since it is smaller than the sum of its proper divisors (33410748).

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

18319812 is a wasteful number, since it uses less digits than its factorization.

18319812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12860 (or 12858 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 18319812 is about 4280.1649500925. The cubic root of 18319812 is about 263.6171562845.

The spelling of 18319812 in words is "eighteen million, three hundred nineteen thousand, eight hundred twelve".