279139 has 4 divisors (see below), whose sum is σ = 319024. Its totient is φ = 239256.

The previous prime is 279137. The next prime is 279143. The reversal of 279139 is 931972.

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 279139 - 2¹ = 279137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 279139.

It is not an unprimeable number, because it can be changed into a prime (279131) 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 3 ways as a sum of consecutive naturals, for example, 19932 + ... + 19945.

It is an arithmetic number, because the mean of its divisors is an integer number (79756).

2²⁷⁹¹³⁹ is an apocalyptic number.

279139 is a deficient number, since it is larger than the sum of its proper divisors (39885).

279139 is an equidigital number, since it uses as much as digits as its factorization.

279139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39884.

The product of its digits is 3402, while the sum is 31.

The square root of 279139 is about 528.3360672905. The cubic root of 279139 is about 65.3542004935.

It can be divided in two parts, 279 and 139, that multiplied together give a triangular number (38781 = T₂₇₈).

The spelling of 279139 in words is "two hundred seventy-nine thousand, one hundred thirty-nine".