779879 has 2 divisors, whose sum is σ = 779880. Its totient is φ = 779878.

The previous prime is 779873. The next prime is 779887. The reversal of 779879 is 978977.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-779879 is a prime.

It is a super-2 number, since 2×779879² = 1216422509282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (779873) 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, 389939 + 389940.

It is an arithmetic number, because the mean of its divisors is an integer number (389940).

2⁷⁷⁹⁸⁷⁹ is an apocalyptic number.

779879 is a deficient number, since it is larger than the sum of its proper divisors (1).

779879 is an equidigital number, since it uses as much as digits as its factorization.

779879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 47.

The square root of 779879 is about 883.1075812153. The cubic root of 779879 is about 92.0468806437.

It can be divided in two parts, 7 and 79879, that multiplied together give a triangular number (559153 = T₁₀₅₇).

The spelling of 779879 in words is "seven hundred seventy-nine thousand, eight hundred seventy-nine".