279939 has 16 divisors (see below), whose sum is σ = 432000. Its totient is φ = 159360.

The previous prime is 279919. The next prime is 279941. The reversal of 279939 is 939972.

It is not a de Polignac number, because 279939 - 2¹¹ = 277891 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 279897 and 279906.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279939.

It is not an unprimeable number, because it can be changed into a prime (279919) 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 in 15 ways as a sum of consecutive naturals, for example, 312 + ... + 810.

It is an arithmetic number, because the mean of its divisors is an integer number (27000).

279939 is a Friedman number, since it can be written as (7-9/9)^(9-2)+3, using all its digits and the basic arithmetic operations.

2²⁷⁹⁹³⁹ is an apocalyptic number.

279939 is a deficient number, since it is larger than the sum of its proper divisors (152061).

279939 is a wasteful number, since it uses less digits than its factorization.

279939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its digits is 30618, while the sum is 39.

The square root of 279939 is about 529.0926194911. The cubic root of 279939 is about 65.4165750243.

The spelling of 279939 in words is "two hundred seventy-nine thousand, nine hundred thirty-nine".