18399744 has 160 divisors (see below), whose sum is σ = 59906880. Its totient is φ = 5575680.

The previous prime is 18399737. The next prime is 18399749. The reversal of 18399744 is 44799381.

The cubic root of 18399744 is 264.

It is a perfect power (a cube), and thus also a powerful number.

Its product of digits (217728) is a multiple of the sum of its prime divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 18399744.

It is not an unprimeable number, because it can be changed into a prime (18399749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1672699 + ... + 1672709.

It is an arithmetic number, because the mean of its divisors is an integer number (374418).

Almost surely, 2^18399744 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 18399744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29953440).

18399744 is an abundant number, since it is smaller than the sum of its proper divisors (41507136).

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

18399744 is an frugal number, since it uses more digits than its factorization.

18399744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 16 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18399744 is about 4289.4922776478.

It can be divided in two parts, 183997 and 44, that added together give a square (184041 = 429²).

The spelling of 18399744 in words is "eighteen million, three hundred ninety-nine thousand, seven hundred forty-four".