279857 has 2 divisors, whose sum is σ = 279858. Its totient is φ = 279856.

The previous prime is 279847. The next prime is 279863. The reversal of 279857 is 758972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279841 + 16 = 529^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 279857 - 2¹⁸ = 17713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 279857.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279857.

It is not a weakly prime, because it can be changed into another prime (279817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139928 + 139929.

It is an arithmetic number, because the mean of its divisors is an integer number (139929).

279857 is a Friedman number, since it can be written as ((8-5)*2)^7-79, using all its digits and the basic arithmetic operations.

2²⁷⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

279857 is a deficient number, since it is larger than the sum of its proper divisors (1).

279857 is an equidigital number, since it uses as much as digits as its factorization.

279857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 279857 is about 529.0151226572. The cubic root of 279857 is about 65.4101871053.

The spelling of 279857 in words is "two hundred seventy-nine thousand, eight hundred fifty-seven".