13539665 has 8 divisors (see below), whose sum is σ = 16808040. Its totient is φ = 10458112.

The previous prime is 13539661. The next prime is 13539671. The reversal of 13539665 is 56693531.

13539665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4635409 + 8904256 = 2153^2 + 2984^2 .

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 13539665 - 2² = 13539661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13539661) 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, 46544 + ... + 46833.

It is an arithmetic number, because the mean of its divisors is an integer number (2101005).

Almost surely, 2^13539665 is an apocalyptic number.

It is an amenable number.

13539665 is a deficient number, since it is larger than the sum of its proper divisors (3268375).

13539665 is an equidigital number, since it uses as much as digits as its factorization.

13539665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93411.

The product of its digits is 72900, while the sum is 38.

The square root of 13539665 is about 3679.6283779751. The cubic root of 13539665 is about 238.3431307474.

The spelling of 13539665 in words is "thirteen million, five hundred thirty-nine thousand, six hundred sixty-five".