779979 has 4 divisors (see below), whose sum is σ = 1039976. Its totient is φ = 519984.

The previous prime is 779971. The next prime is 779981. The reversal of 779979 is 979977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979977 = 3 ⋅326659.

It is not a de Polignac number, because 779979 - 2³ = 779971 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779971) 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 in 3 ways as a sum of consecutive naturals, for example, 129994 + ... + 129999.

It is an arithmetic number, because the mean of its divisors is an integer number (259994).

2⁷⁷⁹⁹⁷⁹ is an apocalyptic number.

779979 is a deficient number, since it is larger than the sum of its proper divisors (259997).

779979 is a wasteful number, since it uses less digits than its factorization.

779979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259996.

The product of its digits is 250047, while the sum is 48.

The square root of 779979 is about 883.1641976439. The cubic root of 779979 is about 92.0508147133.

The spelling of 779979 in words is "seven hundred seventy-nine thousand, nine hundred seventy-nine".