12687813 has 8 divisors (see below), whose sum is σ = 18796800. Its totient is φ = 8458524.

The previous prime is 12687803. The next prime is 12687821. The reversal of 12687813 is 31878621.

It is not a de Polignac number, because 12687813 - 2⁶ = 12687749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12687803) 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 in 7 ways as a sum of consecutive naturals, for example, 234933 + ... + 234986.

It is an arithmetic number, because the mean of its divisors is an integer number (2349600).

Almost surely, 2^12687813 is an apocalyptic number.

It is an amenable number.

12687813 is a deficient number, since it is larger than the sum of its proper divisors (6108987).

12687813 is an equidigital number, since it uses as much as digits as its factorization.

12687813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469928 (or 469922 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12687813 is about 3561.9956485094. The cubic root of 12687813 is about 233.2360027167.

The spelling of 12687813 in words is "twelve million, six hundred eighty-seven thousand, eight hundred thirteen".