18347868 has 72 divisors (see below), whose sum is σ = 57832320. Its totient is φ = 4764960.

The previous prime is 18347851. The next prime is 18347887. The reversal of 18347868 is 86874381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538 + ... + 6081.

Almost surely, 2^18347868 is an apocalyptic number.

18347868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18347868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28916160).

18347868 is an abundant number, since it is smaller than the sum of its proper divisors (39484452).

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

18347868 is a wasteful number, since it uses less digits than its factorization.

18347868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647 (or 6642 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18347868 is about 4283.4411400182. The cubic root of 18347868 is about 263.7516604045.

The spelling of 18347868 in words is "eighteen million, three hundred forty-seven thousand, eight hundred sixty-eight".