13439521 has 16 divisors (see below), whose sum is σ = 14598144. Its totient is φ = 12340944.

The previous prime is 13439497. The next prime is 13439527. The reversal of 13439521 is 12593431.

13439521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13439521 - 2⁹ = 13439009 is a prime.

It is a pancake number, because a pancake can be divided into 13439521 parts by 5184 straight cuts.

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 13439521.

It is not an unprimeable number, because it can be changed into a prime (13439527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105760 + ... + 105886.

It is an arithmetic number, because the mean of its divisors is an integer number (912384).

Almost surely, 2^13439521 is an apocalyptic number.

It is an amenable number.

13439521 is a deficient number, since it is larger than the sum of its proper divisors (1158623).

13439521 is a wasteful number, since it uses less digits than its factorization.

13439521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300.

The product of its digits is 3240, while the sum is 28.

The square root of 13439521 is about 3665.9952264017. The cubic root of 13439521 is about 237.7540535347.

The spelling of 13439521 in words is "thirteen million, four hundred thirty-nine thousand, five hundred twenty-one".