18989328 has 20 divisors (see below), whose sum is σ = 49055888. Its totient is φ = 6329760.

The previous prime is 18989293. The next prime is 18989351. The reversal of 18989328 is 82398981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 395611 = 18989328 / (1 + 8 + 9 + 8 + 9 + 3 + 2 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197758 + ... + 197853.

Almost surely, 2^18989328 is an apocalyptic number.

It is an amenable number.

18989328 is an abundant number, since it is smaller than the sum of its proper divisors (30066560).

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

18989328 is a wasteful number, since it uses less digits than its factorization.

18989328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395622 (or 395616 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 18989328 is about 4357.6746092383. The cubic root of 18989328 is about 266.7901955463.

The spelling of 18989328 in words is "eighteen million, nine hundred eighty-nine thousand, three hundred twenty-eight".