18315372 has 48 divisors (see below), whose sum is σ = 43997184. Its totient is φ = 5928000.

The previous prime is 18315371. The next prime is 18315413. The reversal of 18315372 is 27351381.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18315371) 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, 95797 + ... + 95987.

It is an arithmetic number, because the mean of its divisors is an integer number (916608).

Almost surely, 2^18315372 is an apocalyptic number.

18315372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18315372 is an abundant number, since it is smaller than the sum of its proper divisors (25681812).

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

18315372 is a wasteful number, since it uses less digits than its factorization.

18315372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 18315372 is about 4279.6462470630. The cubic root of 18315372 is about 263.5958577628.

The spelling of 18315372 in words is "eighteen million, three hundred fifteen thousand, three hundred seventy-two".