12886813 has 4 divisors (see below), whose sum is σ = 12898620. Its totient is φ = 12875008.

The previous prime is 12886781. The next prime is 12886843. The reversal of 12886813 is 31868821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2913849 + 9972964 = 1707^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 12886813 - 2⁵ = 12886781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12886843) 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 3 ways as a sum of consecutive naturals, for example, 4078 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (3224655).

Almost surely, 2^12886813 is an apocalyptic number.

It is an amenable number.

12886813 is a deficient number, since it is larger than the sum of its proper divisors (11807).

12886813 is a wasteful number, since it uses less digits than its factorization.

12886813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11806.

The product of its digits is 18432, while the sum is 37.

The square root of 12886813 is about 3589.8207476140. The cubic root of 12886813 is about 234.4490670324.

It can be divided in two parts, 128868 and 13, that added together give a square (128881 = 359²).

The spelling of 12886813 in words is "twelve million, eight hundred eighty-six thousand, eight hundred thirteen".