18398328 has 64 divisors (see below), whose sum is σ = 50080800. Its totient is φ = 5598720.

The previous prime is 18398309. The next prime is 18398333. The reversal of 18398328 is 82389381.

It is a self number, because there is not a number n which added to its sum of digits gives 18398328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33738 + ... + 34278.

Almost surely, 2^18398328 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 18398328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25040400).

18398328 is an abundant number, since it is smaller than the sum of its proper divisors (31682472).

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

18398328 is a wasteful number, since it uses less digits than its factorization.

18398328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 668 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 18398328 is about 4289.3272199728. The cubic root of 18398328 is about 263.9932275581.

The spelling of 18398328 in words is "eighteen million, three hundred ninety-eight thousand, three hundred twenty-eight".