18308136 has 64 divisors (see below), whose sum is σ = 57070080. Its totient is φ = 4754880.

The previous prime is 18308123. The next prime is 18308137. The reversal of 18308136 is 63180381.

18308136 = 231² + 232² + ... + 406².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308137) 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, 3106 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (891720).

Almost surely, 2^18308136 is an apocalyptic number.

It is an amenable number.

18308136 is an abundant number, since it is smaller than the sum of its proper divisors (38761944).

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

18308136 is a wasteful number, since it uses less digits than its factorization.

18308136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9934 (or 9930 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18308136 is about 4278.8007665700. The cubic root of 18308136 is about 263.5611395514.

The spelling of 18308136 in words is "eighteen million, three hundred eight thousand, one hundred thirty-six".