18447972 has 24 divisors (see below), whose sum is σ = 43334592. Its totient is φ = 6108000.

The previous prime is 18447967. The next prime is 18447983. The reversal of 18447972 is 27974481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 3279 + ... + 6902.

It is an arithmetic number, because the mean of its divisors is an integer number (1805608).

Almost surely, 2^18447972 is an apocalyptic number.

18447972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18447972 is an abundant number, since it is smaller than the sum of its proper divisors (24886620).

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

18447972 is a wasteful number, since it uses less digits than its factorization.

18447972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339 (or 10337 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 18447972 is about 4295.1102430555. The cubic root of 18447972 is about 264.2304576258.

The spelling of 18447972 in words is "eighteen million, four hundred forty-seven thousand, nine hundred seventy-two".