18189472 has 24 divisors (see below), whose sum is σ = 40926816. Its totient is φ = 7795392.

The previous prime is 18189469. The next prime is 18189487. The reversal of 18189472 is 27498181.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40378 + ... + 40825.

It is an arithmetic number, because the mean of its divisors is an integer number (1705284).

Almost surely, 2^18189472 is an apocalyptic number.

It is an amenable number.

18189472 is an abundant number, since it is smaller than the sum of its proper divisors (22737344).

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

18189472 is an equidigital number, since it uses as much as digits as its factorization.

18189472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81220 (or 81212 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 18189472 is about 4264.9117224158. The cubic root of 18189472 is about 262.9904819043.

The spelling of 18189472 in words is "eighteen million, one hundred eighty-nine thousand, four hundred seventy-two".