279623 has 4 divisors (see below), whose sum is σ = 294360. Its totient is φ = 264888.

The previous prime is 279619. The next prime is 279637. The reversal of 279623 is 326972.

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 279623 - 2² = 279619 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279613) 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, 7340 + ... + 7377.

It is an arithmetic number, because the mean of its divisors is an integer number (73590).

279623 is a Friedman number, since it can be written as 9-322+6^7, using all its digits and the basic arithmetic operations.

2²⁷⁹⁶²³ is an apocalyptic number.

279623 is a deficient number, since it is larger than the sum of its proper divisors (14737).

279623 is a wasteful number, since it uses less digits than its factorization.

279623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14736.

The product of its digits is 4536, while the sum is 29.

The square root of 279623 is about 528.7939107062. The cubic root of 279623 is about 65.3919513018.

The spelling of 279623 in words is "two hundred seventy-nine thousand, six hundred twenty-three".