279666 has 16 divisors (see below), whose sum is σ = 621600. Its totient is φ = 93204.

The previous prime is 279659. The next prime is 279679. The reversal of 279666 is 666972.

279666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 279666.

It is an unprimeable number.

279666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 2536 + ... + 2643.

It is an arithmetic number, because the mean of its divisors is an integer number (38850).

279666 is a Friedman number, since it can be written as 6^7+9*(6-6^2), using all its digits and the basic arithmetic operations.

2²⁷⁹⁶⁶⁶ is an apocalyptic number.

279666 is an abundant number, since it is smaller than the sum of its proper divisors (341934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

279666 is a wasteful number, since it uses less digits than its factorization.

279666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5190 (or 5184 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 279666 is about 528.8345677053. The cubic root of 279666 is about 65.3953030883.

It can be divided in two parts, 27966 and 6, that added together give a palindrome (27972).

The spelling of 279666 in words is "two hundred seventy-nine thousand, six hundred sixty-six".