13239991 has 8 divisors (see below), whose sum is σ = 14115600. Its totient is φ = 12375168.

The previous prime is 13239949. The next prime is 13239997. The reversal of 13239991 is 19993231.

13239991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13239991 - 2²¹ = 11142839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13239991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13239997) 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, 81 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (1764450).

Almost surely, 2^13239991 is an apocalyptic number.

13239991 is a deficient number, since it is larger than the sum of its proper divisors (875609).

13239991 is a wasteful number, since it uses less digits than its factorization.

13239991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393.

The product of its digits is 13122, while the sum is 37.

The square root of 13239991 is about 3638.6798430200. The cubic root of 13239991 is about 236.5715761167.

The spelling of 13239991 in words is "thirteen million, two hundred thirty-nine thousand, nine hundred ninety-one".