18304812 has 24 divisors (see below), whose sum is σ = 47457200. Its totient is φ = 6101568.

The previous prime is 18304807. The next prime is 18304813. The reversal of 18304812 is 21840381.

18304812 is a `hidden beast` number, since 183 + 0 + 481 + 2 = 666.

It is a super-2 number, since 2×18304812² = 670132284710688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18304813) 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 7 ways as a sum of consecutive naturals, for example, 84637 + ... + 84852.

Almost surely, 2^18304812 is an apocalyptic number.

18304812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18304812 is an abundant number, since it is smaller than the sum of its proper divisors (29152388).

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

18304812 is a wasteful number, since it uses less digits than its factorization.

18304812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169502 (or 169494 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18304812 is about 4278.4123223458. The cubic root of 18304812 is about 263.5451879866.

The spelling of 18304812 in words is "eighteen million, three hundred four thousand, eight hundred twelve".