279923 has 4 divisors (see below), whose sum is σ = 319920. Its totient is φ = 239928.

The previous prime is 279919. The next prime is 279941. The reversal of 279923 is 329972.

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 279923 - 2² = 279919 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 279923.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279923.

It is not an unprimeable number, because it can be changed into a prime (279913) 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, 19988 + ... + 20001.

It is an arithmetic number, because the mean of its divisors is an integer number (79980).

279923 is a Friedman number, since it can be written as (9-3)^7-9-2-2, using all its digits and the basic arithmetic operations.

2²⁷⁹⁹²³ is an apocalyptic number.

279923 is a deficient number, since it is larger than the sum of its proper divisors (39997).

279923 is an equidigital number, since it uses as much as digits as its factorization.

279923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39996.

The product of its digits is 6804, while the sum is 32.

The square root of 279923 is about 529.0774990491. The cubic root of 279923 is about 65.4153286991.

The spelling of 279923 in words is "two hundred seventy-nine thousand, nine hundred twenty-three".