13857539 has 4 divisors (see below), whose sum is σ = 14119056. Its totient is φ = 13596024.

The previous prime is 13857521. The next prime is 13857551. The reversal of 13857539 is 93575831.

It is a happy number.

13857539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93575831 = 1637 ⋅57163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13857539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13857496 and 13857505.

It is not an unprimeable number, because it can be changed into a prime (13857509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130679 + ... + 130784.

It is an arithmetic number, because the mean of its divisors is an integer number (3529764).

Almost surely, 2^13857539 is an apocalyptic number.

13857539 is a deficient number, since it is larger than the sum of its proper divisors (261517).

13857539 is an equidigital number, since it uses as much as digits as its factorization.

13857539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261516.

The product of its digits is 113400, while the sum is 41.

The square root of 13857539 is about 3722.5715574049. The cubic root of 13857539 is about 240.1939346819.

The spelling of 13857539 in words is "thirteen million, eight hundred fifty-seven thousand, five hundred thirty-nine".