13856687 has 4 divisors (see below), whose sum is σ = 14922600. Its totient is φ = 12790776.

The previous prime is 13856671. The next prime is 13856723. The reversal of 13856687 is 78665831.

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 13856687 - 2⁴ = 13856671 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 (13856617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532937 + ... + 532962.

It is an arithmetic number, because the mean of its divisors is an integer number (3730650).

Almost surely, 2^13856687 is an apocalyptic number.

13856687 is a deficient number, since it is larger than the sum of its proper divisors (1065913).

13856687 is a wasteful number, since it uses less digits than its factorization.

13856687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065912.

The product of its digits is 241920, while the sum is 44.

The square root of 13856687 is about 3722.4571186247. The cubic root of 13856687 is about 240.1890119842.

The spelling of 13856687 in words is "thirteen million, eight hundred fifty-six thousand, six hundred eighty-seven".