18722368 has 84 divisors (see below), whose sum is σ = 44947840. Its totient is φ = 7577856.

The previous prime is 18722359. The next prime is 18722377. The reversal of 18722368 is 86322781.

It is an interprime number because it is at equal distance from previous prime (18722359) and next prime (18722377).

Its product of digits (32256) is a multiple of the sum of its prime factors (144).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236953 + ... + 237031.

Almost surely, 2^18722368 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 18722368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22473920).

18722368 is an abundant number, since it is smaller than the sum of its proper divisors (26225472).

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

18722368 is an equidigital number, since it uses as much as digits as its factorization.

18722368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 111 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 18722368 is about 4326.9351740002. The cubic root of 18722368 is about 265.5340742168.

The spelling of 18722368 in words is "eighteen million, seven hundred twenty-two thousand, three hundred sixty-eight".