15328989 has 24 divisors (see below), whose sum is σ = 24496472. Its totient is φ = 9175680.

The previous prime is 15328987. The next prime is 15328993. The reversal of 15328989 is 98982351.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2152089 + 13176900 = 1467^2 + 3630^2 .

It is not a de Polignac number, because 15328989 - 2¹ = 15328987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15328987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2559 + ... + 6099.

Almost surely, 2^15328989 is an apocalyptic number.

It is an amenable number.

15328989 is a deficient number, since it is larger than the sum of its proper divisors (9167483).

15328989 is a wasteful number, since it uses less digits than its factorization.

15328989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597 (or 3594 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 15328989 is about 3915.2252808747. The cubic root of 15328989 is about 248.4111989008.

The spelling of 15328989 in words is "fifteen million, three hundred twenty-eight thousand, nine hundred eighty-nine".