12279779 has 2 divisors, whose sum is σ = 12279780. Its totient is φ = 12279778.

The previous prime is 12279703. The next prime is 12279781. The reversal of 12279779 is 97797221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12279779 - 2¹⁶ = 12214243 is a prime.

Together with 12279781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12272779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6139889 + 6139890.

It is an arithmetic number, because the mean of its divisors is an integer number (6139890).

Almost surely, 2^12279779 is an apocalyptic number.

12279779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12279779 is an equidigital number, since it uses as much as digits as its factorization.

12279779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 44.

The square root of 12279779 is about 3504.2515606046. The cubic root of 12279779 is about 230.7084582507.

The spelling of 12279779 in words is "twelve million, two hundred seventy-nine thousand, seven hundred seventy-nine".