13856517 has 6 divisors (see below), whose sum is σ = 20014982. Its totient is φ = 9237672.

The previous prime is 13856509. The next prime is 13856527. The reversal of 13856517 is 71565831.

13856517 is a `hidden beast` number, since 138 + 5 + 6 + 517 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7834401 + 6022116 = 2799^2 + 2454^2 .

It is not a de Polignac number, because 13856517 - 2³ = 13856509 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 (13856527) 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 5 ways as a sum of consecutive naturals, for example, 769798 + ... + 769815.

Almost surely, 2^13856517 is an apocalyptic number.

It is an amenable number.

13856517 is a deficient number, since it is larger than the sum of its proper divisors (6158465).

13856517 is a wasteful number, since it uses less digits than its factorization.

13856517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539619 (or 1539616 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 13856517 is about 3722.4342841748. The cubic root of 13856517 is about 240.1880297316.

The spelling of 13856517 in words is "thirteen million, eight hundred fifty-six thousand, five hundred seventeen".