18647472 has 20 divisors (see below), whose sum is σ = 48172760. Its totient is φ = 6215808.

The previous prime is 18647437. The next prime is 18647477. The reversal of 18647472 is 27474681.

It is a self number, because there is not a number n which added to its sum of digits gives 18647472.

It is not an unprimeable number, because it can be changed into a prime (18647477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194197 + ... + 194292.

It is an arithmetic number, because the mean of its divisors is an integer number (2408638).

Almost surely, 2^18647472 is an apocalyptic number.

18647472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18647472 is an abundant number, since it is smaller than the sum of its proper divisors (29525288).

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

18647472 is a wasteful number, since it uses less digits than its factorization.

18647472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388500 (or 388494 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 18647472 is about 4318.2718765728. The cubic root of 18647472 is about 265.1795247279.

The spelling of 18647472 in words is "eighteen million, six hundred forty-seven thousand, four hundred seventy-two".