779971 has 2 divisors, whose sum is σ = 779972. Its totient is φ = 779970.

The previous prime is 779939. The next prime is 779981. The reversal of 779971 is 179977.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 779971 - 2⁵ = 779939 is a prime.

It is a Chen prime.

779971 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (779981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389985 + 389986.

It is an arithmetic number, because the mean of its divisors is an integer number (389986).

2⁷⁷⁹⁹⁷¹ is an apocalyptic number.

779971 is a deficient number, since it is larger than the sum of its proper divisors (1).

779971 is an equidigital number, since it uses as much as digits as its factorization.

779971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27783, while the sum is 40.

The square root of 779971 is about 883.1596684632. The cubic root of 779971 is about 92.0505000001.

It can be divided in two parts, 77 and 9971, that multiplied together give a palindrome (767767).

The spelling of 779971 in words is "seven hundred seventy-nine thousand, nine hundred seventy-one".