12786913 has 2 divisors, whose sum is σ = 12786914. Its totient is φ = 12786912.

The previous prime is 12786901. The next prime is 12786937. The reversal of 12786913 is 31968721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7273809 + 5513104 = 2697^2 + 2348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12786913 is a prime.

It is not a weakly prime, because it can be changed into another prime (12783913) 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, 6393456 + 6393457.

It is an arithmetic number, because the mean of its divisors is an integer number (6393457).

Almost surely, 2^12786913 is an apocalyptic number.

It is an amenable number.

12786913 is a deficient number, since it is larger than the sum of its proper divisors (1).

12786913 is an equidigital number, since it uses as much as digits as its factorization.

12786913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 12786913 is about 3575.8793324160. The cubic root of 12786913 is about 233.8416697464.

It can be divided in two parts, 127 and 86913, that multiplied together give a triangular number (11037951 = T₄₆₉₈).

The spelling of 12786913 in words is "twelve million, seven hundred eighty-six thousand, nine hundred thirteen".