13857685 has 4 divisors (see below), whose sum is σ = 16629228. Its totient is φ = 11086144.

The previous prime is 13857667. The next prime is 13857691. The reversal of 13857685 is 58675831.

13857685 is digitally balanced in base 3, 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: 58675831 = 89 ⋅659279.

It can be written as a sum of positive squares in 2 ways, for example, as 6421156 + 7436529 = 2534^2 + 2727^2 .

It is a cyclic number.

It is not a de Polignac number, because 13857685 - 2¹⁵ = 13824917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385764 + ... + 1385773.

It is an arithmetic number, because the mean of its divisors is an integer number (4157307).

Almost surely, 2^13857685 is an apocalyptic number.

It is an amenable number.

13857685 is a deficient number, since it is larger than the sum of its proper divisors (2771543).

13857685 is an equidigital number, since it uses as much as digits as its factorization.

13857685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771542.

The product of its digits is 201600, while the sum is 43.

The square root of 13857685 is about 3722.5911674531. The cubic root of 13857685 is about 240.1947782225.

The spelling of 13857685 in words is "thirteen million, eight hundred fifty-seven thousand, six hundred eighty-five".