18324972 has 18 divisors (see below), whose sum is σ = 46321548. Its totient is φ = 6108312.

The previous prime is 18324967. The next prime is 18324973. The reversal of 18324972 is 27942381.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 509027 = 18324972 / (1 + 8 + 3 + 2 + 4 + 9 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (18324973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 254478 + ... + 254549.

Almost surely, 2^18324972 is an apocalyptic number.

18324972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18324972 is an abundant number, since it is smaller than the sum of its proper divisors (27996576).

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

18324972 is a wasteful number, since it uses less digits than its factorization.

18324972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509037 (or 509032 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18324972 is about 4280.7676881606. The cubic root of 18324972 is about 263.6419042975.

The spelling of 18324972 in words is "eighteen million, three hundred twenty-four thousand, nine hundred seventy-two".