15328391 has 8 divisors (see below), whose sum is σ = 16537920. Its totient is φ = 14123232.

The previous prime is 15328387. The next prime is 15328393. The reversal of 15328391 is 19382351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15328391 - 2² = 15328387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15328393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13346 + ... + 14448.

It is an arithmetic number, because the mean of its divisors is an integer number (2067240).

Almost surely, 2^15328391 is an apocalyptic number.

15328391 is a deficient number, since it is larger than the sum of its proper divisors (1209529).

15328391 is a wasteful number, since it uses less digits than its factorization.

15328391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185.

The product of its digits is 6480, while the sum is 32.

The square root of 15328391 is about 3915.1489115997. The cubic root of 15328391 is about 248.4079685980.

The spelling of 15328391 in words is "fifteen million, three hundred twenty-eight thousand, three hundred ninety-one".