12439979 has 2 divisors, whose sum is σ = 12439980. Its totient is φ = 12439978.

The previous prime is 12439969. The next prime is 12440009. The reversal of 12439979 is 97993421.

It is a weak prime.

It is an emirp because it is prime and its reverse (97993421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12439979 - 2⁸ = 12439723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12439909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219989 + 6219990.

It is an arithmetic number, because the mean of its divisors is an integer number (6219990).

Almost surely, 2^12439979 is an apocalyptic number.

12439979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12439979 is an equidigital number, since it uses as much as digits as its factorization.

12439979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 12439979 is about 3527.0354407065. The cubic root of 12439979 is about 231.7073884790.

The spelling of 12439979 in words is "twelve million, four hundred thirty-nine thousand, nine hundred seventy-nine".