13685647 has 4 divisors (see below), whose sum is σ = 13793536. Its totient is φ = 13577760.

The previous prime is 13685641. The next prime is 13685657. The reversal of 13685647 is 74658631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74658631 = 199 ⋅375169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13685647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13685641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53754 + ... + 54007.

It is an arithmetic number, because the mean of its divisors is an integer number (3448384).

Almost surely, 2^13685647 is an apocalyptic number.

13685647 is a deficient number, since it is larger than the sum of its proper divisors (107889).

13685647 is a wasteful number, since it uses less digits than its factorization.

13685647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107888.

The product of its digits is 120960, while the sum is 40.

The square root of 13685647 is about 3699.4117099885. The cubic root of 13685647 is about 239.1966600858.

The spelling of 13685647 in words is "thirteen million, six hundred eighty-five thousand, six hundred forty-seven".