279823 has 2 divisors, whose sum is σ = 279824. Its totient is φ = 279822.

The previous prime is 279817. The next prime is 279847. The reversal of 279823 is 328972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 279823 - 2⁹ = 279311 is a prime.

It is a super-2 number, since 2×279823² = 156601822658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139911 + 139912.

It is an arithmetic number, because the mean of its divisors is an integer number (139912).

2²⁷⁹⁸²³ is an apocalyptic number.

279823 is a deficient number, since it is larger than the sum of its proper divisors (1).

279823 is an equidigital number, since it uses as much as digits as its factorization.

279823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 279823 is about 528.9829864939. The cubic root of 279823 is about 65.4075380900.

The spelling of 279823 in words is "two hundred seventy-nine thousand, eight hundred twenty-three".