775979 has 4 divisors (see below), whose sum is σ = 816840. Its totient is φ = 735120.

The previous prime is 775963. The next prime is 775987. The reversal of 775979 is 979577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979577 = 59 ⋅16603.

It is a cyclic number.

It is not a de Polignac number, because 775979 - 2⁴ = 775963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775919) 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, 20402 + ... + 20439.

It is an arithmetic number, because the mean of its divisors is an integer number (204210).

2⁷⁷⁵⁹⁷⁹ is an apocalyptic number.

775979 is a deficient number, since it is larger than the sum of its proper divisors (40861).

775979 is a wasteful number, since it uses less digits than its factorization.

775979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40860.

The product of its digits is 138915, while the sum is 44.

The square root of 775979 is about 880.8967022302. The cubic root of 775979 is about 91.8931888958.

The spelling of 775979 in words is "seven hundred seventy-five thousand, nine hundred seventy-nine".