18111984 has 40 divisors (see below), whose sum is σ = 51044352. Its totient is φ = 5488320.

The previous prime is 18111949. The next prime is 18112001. The reversal of 18111984 is 48911181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16624 + ... + 17679.

Almost surely, 2^18111984 is an apocalyptic number.

It is an amenable number.

18111984 is an abundant number, since it is smaller than the sum of its proper divisors (32932368).

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

18111984 is a wasteful number, since it uses less digits than its factorization.

18111984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34325 (or 34319 counting only the distinct ones).

The product of its digits is 2304, while the sum is 33.

The square root of 18111984 is about 4255.8176652672. The cubic root of 18111984 is about 262.6164997627.

The spelling of 18111984 in words is "eighteen million, one hundred eleven thousand, nine hundred eighty-four".