18393728 has 64 divisors (see below), whose sum is σ = 39657600. Its totient is φ = 8466432.

The previous prime is 18393701. The next prime is 18393751. The reversal of 18393728 is 82739381.

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

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, 171851 + ... + 171957.

It is an arithmetic number, because the mean of its divisors is an integer number (619650).

Almost surely, 2^18393728 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 18393728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19828800).

18393728 is an abundant number, since it is smaller than the sum of its proper divisors (21263872).

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

18393728 is a wasteful number, since it uses less digits than its factorization.

18393728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 205 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 18393728 is about 4288.7909718241. The cubic root of 18393728 is about 263.9712242894.

The spelling of 18393728 in words is "eighteen million, three hundred ninety-three thousand, seven hundred twenty-eight".