13117856 has 12 divisors (see below), whose sum is σ = 25825842. Its totient is φ = 6558912.

The previous prime is 13117849. The next prime is 13117873. The reversal of 13117856 is 65871131.

It can be written as a sum of positive squares in only one way, i.e., 13104400 + 13456 = 3620^2 + 116^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 409933 = 13117856 / (1 + 3 + 1 + 1 + 7 + 8 + 5 + 6).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204935 + ... + 204998.

Almost surely, 2^13117856 is an apocalyptic number.

13117856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13117856 is a deficient number, since it is larger than the sum of its proper divisors (12707986).

13117856 is an equidigital number, since it uses as much as digits as its factorization.

13117856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409943 (or 409935 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 13117856 is about 3621.8580866732. The cubic root of 13117856 is about 235.8418935268.

Adding to 13117856 its reverse (65871131), we get a palindrome (78988987).

The spelling of 13117856 in words is "thirteen million, one hundred seventeen thousand, eight hundred fifty-six".