18123864 has 72 divisors (see below), whose sum is σ = 50441580. Its totient is φ = 5422560.

The previous prime is 18123857. The next prime is 18123877. The reversal of 18123864 is 46832181.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 229377 + ... + 229455.

Almost surely, 2^18123864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18123864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25220790).

18123864 is an abundant number, since it is smaller than the sum of its proper divisors (32317716).

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

18123864 is a wasteful number, since it uses less digits than its factorization.

18123864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 95 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 18123864 is about 4257.2131729572. The cubic root of 18123864 is about 262.6739056242.

The spelling of 18123864 in words is "eighteen million, one hundred twenty-three thousand, eight hundred sixty-four".