15239891 has 6 divisors (see below), whose sum is σ = 15573300. Its totient is φ = 14913476.

The previous prime is 15239867. The next prime is 15239899. The reversal of 15239891 is 19893251.

15239891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15239891 - 2⁶ = 15239827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15239899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1241 + ... + 5658.

It is an arithmetic number, because the mean of its divisors is an integer number (2595550).

Almost surely, 2^15239891 is an apocalyptic number.

15239891 is a deficient number, since it is larger than the sum of its proper divisors (333409).

15239891 is an frugal number, since it uses more digits than its factorization.

15239891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6993 (or 6946 counting only the distinct ones).

The product of its digits is 19440, while the sum is 38.

The square root of 15239891 is about 3903.8302985658. The cubic root of 15239891 is about 247.9289761497.

The spelling of 15239891 in words is "fifteen million, two hundred thirty-nine thousand, eight hundred ninety-one".