18918072 has 48 divisors (see below), whose sum is σ = 53937000. Its totient is φ = 5973696.

The previous prime is 18918071. The next prime is 18918073. The reversal of 18918072 is 27081981.

It is an interprime number because it is at equal distance from previous prime (18918071) and next prime (18918073).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918071) 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, 5547 + ... + 8282.

Almost surely, 2^18918072 is an apocalyptic number.

18918072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18918072 is an abundant number, since it is smaller than the sum of its proper divisors (35018928).

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

18918072 is a wasteful number, since it uses less digits than its factorization.

18918072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13860 (or 13853 counting only the distinct ones).

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

The square root of 18918072 is about 4349.4910047039. The cubic root of 18918072 is about 266.4560740118.

The spelling of 18918072 in words is "eighteen million, nine hundred eighteen thousand, seventy-two".