1279829939 has 2 divisors, whose sum is σ = 1279829940. Its totient is φ = 1279829938.

The previous prime is 1279829909. The next prime is 1279829951. The reversal of 1279829939 is 9399289721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279829939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279829909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639914969 + 639914970.

It is an arithmetic number, because the mean of its divisors is an integer number (639914970).

Almost surely, 2^1279829939 is an apocalyptic number.

1279829939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279829939 is an equidigital number, since it uses as much as digits as its factorization.

1279829939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 1279829939 is about 35774.7108863230. The cubic root of 1279829939 is about 1085.7189594485.

The spelling of 1279829939 in words is "one billion, two hundred seventy-nine million, eight hundred twenty-nine thousand, nine hundred thirty-nine".