279979 has 16 divisors (see below), whose sum is σ = 350208. Its totient is φ = 218592.

The previous prime is 279977. The next prime is 279991. The reversal of 279979 is 979972.

It is not a de Polignac number, because 279979 - 2¹ = 279977 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (279977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5934 + ... + 5980.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2²⁷⁹⁹⁷⁹ is an apocalyptic number.

279979 is a deficient number, since it is larger than the sum of its proper divisors (70229).

279979 is a wasteful number, since it uses less digits than its factorization.

279979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114.

The product of its digits is 71442, while the sum is 43.

The square root of 279979 is about 529.1304187060. The cubic root of 279979 is about 65.4196906297.

Subtracting from 279979 its sum of digits (43), we obtain a 7-th power (279936 = 6⁷).

The spelling of 279979 in words is "two hundred seventy-nine thousand, nine hundred seventy-nine".