780979 has 4 divisors (see below), whose sum is σ = 783000. Its totient is φ = 778960.

The previous prime is 780973. The next prime is 780991. The reversal of 780979 is 979087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979087 = 23 ⋅42569.

It is a cyclic number.

It is not a de Polignac number, because 780979 - 2³ = 780971 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780971) 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, 229 + ... + 1270.

It is an arithmetic number, because the mean of its divisors is an integer number (195750).

2⁷⁸⁰⁹⁷⁹ is an apocalyptic number.

780979 is a deficient number, since it is larger than the sum of its proper divisors (2021).

780979 is a wasteful number, since it uses less digits than its factorization.

780979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 780979 is about 883.7301624365. The cubic root of 780979 is about 92.0901369274.

The spelling of 780979 in words is "seven hundred eighty thousand, nine hundred seventy-nine".