12786871 has 2 divisors, whose sum is σ = 12786872. Its totient is φ = 12786870.

The previous prime is 12786863. The next prime is 12786889. The reversal of 12786871 is 17868721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12786871 - 2³ = 12786863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393435 + 6393436.

It is an arithmetic number, because the mean of its divisors is an integer number (6393436).

Almost surely, 2^12786871 is an apocalyptic number.

12786871 is a deficient number, since it is larger than the sum of its proper divisors (1).

12786871 is an equidigital number, since it uses as much as digits as its factorization.

12786871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 12786871 is about 3575.8734597298. The cubic root of 12786871 is about 233.8414137200.

It can be divided in two parts, 1 and 2786871, that added together give a palindrome (2786872).

The spelling of 12786871 in words is "twelve million, seven hundred eighty-six thousand, eight hundred seventy-one".