13087239 has 24 divisors (see below), whose sum is σ = 19815936. Its totient is φ = 7669200.

The previous prime is 13087213. The next prime is 13087259. The reversal of 13087239 is 93278031.

13087239 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 13087239 - 2⁷ = 13087111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13087259) 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, 10672 + ... + 11834.

It is an arithmetic number, because the mean of its divisors is an integer number (825664).

Almost surely, 2^13087239 is an apocalyptic number.

13087239 is a deficient number, since it is larger than the sum of its proper divisors (6728697).

13087239 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (13087238) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1219).

13087239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 13087239 is about 3617.6289196102. The cubic root of 13087239 is about 235.6582660525.

The spelling of 13087239 in words is "thirteen million, eighty-seven thousand, two hundred thirty-nine".