279808 has 18 divisors (see below), whose sum is σ = 559034. Its totient is φ = 139776.

The previous prime is 279779. The next prime is 279817. The reversal of 279808 is 808972.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 278784 + 1024 = 528^2 + 32^2 .

It is a d-powerful number, because it can be written as 2¹⁸ + 7⁵ + 8² + 9³ + 0 + 8² .

It is a congruent number.

It is an unprimeable number.

279808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291 + ... + 802.

2²⁷⁹⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

279808 is a deficient number, since it is larger than the sum of its proper divisors (279226).

279808 is an equidigital number, since it uses as much as digits as its factorization.

279808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 279808 is about 528.9688081541. The cubic root of 279808 is about 65.4063693385.

The spelling of 279808 in words is "two hundred seventy-nine thousand, eight hundred eight".