15398891 has 8 divisors (see below), whose sum is σ = 16156320. Its totient is φ = 14648832.

The previous prime is 15398861. The next prime is 15398893. The reversal of 15398891 is 19889351.

It is a happy number.

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 15398891 - 2⁶ = 15398827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15398893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 6173.

It is an arithmetic number, because the mean of its divisors is an integer number (2019540).

Almost surely, 2^15398891 is an apocalyptic number.

15398891 is a deficient number, since it is larger than the sum of its proper divisors (757429).

15398891 is a wasteful number, since it uses less digits than its factorization.

15398891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685.

The product of its digits is 77760, while the sum is 44.

The square root of 15398891 is about 3924.1420718419. The cubic root of 15398891 is about 248.7882211919.

The spelling of 15398891 in words is "fifteen million, three hundred ninety-eight thousand, eight hundred ninety-one".