18658944 has 64 divisors (see below), whose sum is σ = 55080000. Its totient is φ = 6218496.

The previous prime is 18658933. The next prime is 18658963. The reversal of 18658944 is 44985681.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 18658944.

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, 757 + ... + 6155.

It is an arithmetic number, because the mean of its divisors is an integer number (860625).

Almost surely, 2^18658944 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 18658944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27540000).

18658944 is an abundant number, since it is smaller than the sum of its proper divisors (36421056).

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

18658944 is an equidigital number, since it uses as much as digits as its factorization.

18658944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422 (or 5404 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 18658944 is about 4319.5999814798. The cubic root of 18658944 is about 265.2338934180.

The spelling of 18658944 in words is "eighteen million, six hundred fifty-eight thousand, nine hundred forty-four".