18307812 has 48 divisors (see below), whose sum is σ = 44255232. Its totient is φ = 5886720.

The previous prime is 18307799. The next prime is 18307813. The reversal of 18307812 is 21870381.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18307812.

It is not an unprimeable number, because it can be changed into a prime (18307813) 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 15 ways as a sum of consecutive naturals, for example, 62338 + ... + 62630.

It is an arithmetic number, because the mean of its divisors is an integer number (921984).

Almost surely, 2^18307812 is an apocalyptic number.

18307812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18307812 is an abundant number, since it is smaller than the sum of its proper divisors (25947420).

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

18307812 is a wasteful number, since it uses less digits than its factorization.

18307812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18307812 is about 4278.7629053267. The cubic root of 18307812 is about 263.5595847906.

The spelling of 18307812 in words is "eighteen million, three hundred seven thousand, eight hundred twelve".