12687679 has 2 divisors, whose sum is σ = 12687680. Its totient is φ = 12687678.

The previous prime is 12687673. The next prime is 12687683. The reversal of 12687679 is 97678621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12687679 - 2³ = 12687671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12687671) 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, 6343839 + 6343840.

It is an arithmetic number, because the mean of its divisors is an integer number (6343840).

Almost surely, 2^12687679 is an apocalyptic number.

12687679 is a deficient number, since it is larger than the sum of its proper divisors (1).

12687679 is an equidigital number, since it uses as much as digits as its factorization.

12687679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 12687679 is about 3561.9768387793. The cubic root of 12687679 is about 233.2351816207.

It can be divided in two parts, 12687 and 679, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 12687679 in words is "twelve million, six hundred eighty-seven thousand, six hundred seventy-nine".