13687856 has 120 divisors (see below), whose sum is σ = 35622720. Its totient is φ = 5031936.

The previous prime is 13687853. The next prime is 13687859. The reversal of 13687856 is 65878631.

It is an interprime number because it is at equal distance from previous prime (13687853) and next prime (13687859).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13687853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173225 + ... + 173303.

It is an arithmetic number, because the mean of its divisors is an integer number (296856).

Almost surely, 2^13687856 is an apocalyptic number.

13687856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13687856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17811360).

13687856 is an abundant number, since it is smaller than the sum of its proper divisors (21934864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13687856 is a wasteful number, since it uses less digits than its factorization.

13687856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 118 counting only the distinct ones).

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

The square root of 13687856 is about 3699.7102589257. The cubic root of 13687856 is about 239.2095289694.

The spelling of 13687856 in words is "thirteen million, six hundred eighty-seven thousand, eight hundred fifty-six".