12687856 has 10 divisors (see below), whose sum is σ = 24582752. Its totient is φ = 6343920.

The previous prime is 12687853. The next prime is 12687863. The reversal of 12687856 is 65878621.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12687853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 396480 + ... + 396511.

Almost surely, 2^12687856 is an apocalyptic number.

12687856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12687856 is a deficient number, since it is larger than the sum of its proper divisors (11894896).

12687856 is an equidigital number, since it uses as much as digits as its factorization.

12687856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792999 (or 792993 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 12687856 is about 3562.0016844465. The cubic root of 12687856 is about 233.2362662014.

The spelling of 12687856 in words is "twelve million, six hundred eighty-seven thousand, eight hundred fifty-six".