279779 has 2 divisors, whose sum is σ = 279780. Its totient is φ = 279778.

The previous prime is 279767. The next prime is 279817. The reversal of 279779 is 977972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 279779 - 2⁸ = 279523 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (279709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139889 + 139890.

It is an arithmetic number, because the mean of its divisors is an integer number (139890).

2²⁷⁹⁷⁷⁹ is an apocalyptic number.

279779 is a deficient number, since it is larger than the sum of its proper divisors (1).

279779 is an equidigital number, since it uses as much as digits as its factorization.

279779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55566, while the sum is 41.

The square root of 279779 is about 528.9413956196. The cubic root of 279779 is about 65.4041096340.

The spelling of 279779 in words is "two hundred seventy-nine thousand, seven hundred seventy-nine".