13697539 has 4 divisors (see below), whose sum is σ = 13989024. Its totient is φ = 13406056.

The previous prime is 13697531. The next prime is 13697543. The reversal of 13697539 is 93579631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13697539 - 2³ = 13697531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13697495 and 13697504.

It is not an unprimeable number, because it can be changed into a prime (13697531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145672 + ... + 145765.

It is an arithmetic number, because the mean of its divisors is an integer number (3497256).

Almost surely, 2^13697539 is an apocalyptic number.

13697539 is a deficient number, since it is larger than the sum of its proper divisors (291485).

13697539 is an equidigital number, since it uses as much as digits as its factorization.

13697539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291484.

The product of its digits is 153090, while the sum is 43.

The square root of 13697539 is about 3701.0186435629. The cubic root of 13697539 is about 239.2659225078.

The spelling of 13697539 in words is "thirteen million, six hundred ninety-seven thousand, five hundred thirty-nine".