12777979 has 2 divisors, whose sum is σ = 12777980. Its totient is φ = 12777978.

The previous prime is 12777967. The next prime is 12778001. The reversal of 12777979 is 97977721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12777979 - 2¹³ = 12769787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12777679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388989 + 6388990.

It is an arithmetic number, because the mean of its divisors is an integer number (6388990).

Almost surely, 2^12777979 is an apocalyptic number.

12777979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12777979 is an equidigital number, since it uses as much as digits as its factorization.

12777979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388962, while the sum is 49.

The square root of 12777979 is about 3574.6299109139. The cubic root of 12777979 is about 233.7871966505.

The spelling of 12777979 in words is "twelve million, seven hundred seventy-seven thousand, nine hundred seventy-nine".