18681324 has 24 divisors (see below), whose sum is σ = 43814400. Its totient is φ = 6195024.

The previous prime is 18681323. The next prime is 18681329. The reversal of 18681324 is 42318681.

It is not an unprimeable number, because it can be changed into a prime (18681323) 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, 1524 + ... + 6299.

It is an arithmetic number, because the mean of its divisors is an integer number (1825600).

Almost surely, 2^18681324 is an apocalyptic number.

It is an amenable number.

18681324 is an abundant number, since it is smaller than the sum of its proper divisors (25133076).

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

18681324 is a wasteful number, since it uses less digits than its factorization.

18681324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8029 (or 8027 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 18681324 is about 4322.1897228141. The cubic root of 18681324 is about 265.3398937518.

The spelling of 18681324 in words is "eighteen million, six hundred eighty-one thousand, three hundred twenty-four".