13856 has 12 divisors (see below), whose sum is σ = 27342. Its totient is φ = 6912.

The previous prime is 13841. The next prime is 13859. The reversal of 13856 is 65831.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 400 = 116^2 + 20^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13859) by changing a digit.

13856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185 + ... + 248.

2¹³⁸⁵⁶ is an apocalyptic number.

13856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13856 is a deficient number, since it is larger than the sum of its proper divisors (13486).

13856 is an equidigital number, since it uses as much as digits as its factorization.

13856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 435 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 13856 is about 117.7115117565. The cubic root of 13856 is about 24.0185042479.

The spelling of 13856 in words is "thirteen thousand, eight hundred fifty-six".