18189072 has 60 divisors (see below), whose sum is σ = 55536624. Its totient is φ = 5511360.

The previous prime is 18189013. The next prime is 18189077. The reversal of 18189072 is 27098181.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is not an unprimeable number, because it can be changed into a prime (18189077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4158 + ... + 7325.

Almost surely, 2^18189072 is an apocalyptic number.

18189072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18189072 is an abundant number, since it is smaller than the sum of its proper divisors (37347552).

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

18189072 is a wasteful number, since it uses less digits than its factorization.

18189072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11508 (or 11499 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18189072 is about 4264.8648278697. The cubic root of 18189072 is about 262.9885541049.

It can be divided in two parts, 181 and 89072, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 18189072 in words is "eighteen million, one hundred eighty-nine thousand, seventy-two".