279859 has 4 divisors (see below), whose sum is σ = 284104. Its totient is φ = 275616.

The previous prime is 279857. The next prime is 279863. The reversal of 279859 is 958972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 279859 - 2¹ = 279857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022 + ... + 2155.

It is an arithmetic number, because the mean of its divisors is an integer number (71026).

2²⁷⁹⁸⁵⁹ is an apocalyptic number.

279859 is a deficient number, since it is larger than the sum of its proper divisors (4245).

279859 is an equidigital number, since it uses as much as digits as its factorization.

279859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4244.

The product of its digits is 45360, while the sum is 40.

The square root of 279859 is about 529.0170129589. The cubic root of 279859 is about 65.4103429230.

The spelling of 279859 in words is "two hundred seventy-nine thousand, eight hundred fifty-nine".