13539657 has 8 divisors (see below), whose sum is σ = 18070560. Its totient is φ = 9017600.

The previous prime is 13539641. The next prime is 13539661. The reversal of 13539657 is 75693531.

13539657 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 13539657 - 2⁴ = 13539641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13539637) 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, 3394 + ... + 6212.

It is an arithmetic number, because the mean of its divisors is an integer number (2258820).

Almost surely, 2^13539657 is an apocalyptic number.

It is an amenable number.

13539657 is a deficient number, since it is larger than the sum of its proper divisors (4530903).

13539657 is a wasteful number, since it uses less digits than its factorization.

13539657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423.

The product of its digits is 85050, while the sum is 39.

The square root of 13539657 is about 3679.6272909087. The cubic root of 13539657 is about 238.3430838052.

It can be divided in two parts, 13539 and 657, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 13539657 in words is "thirteen million, five hundred thirty-nine thousand, six hundred fifty-seven".