279988 has 6 divisors (see below), whose sum is σ = 489986. Its totient is φ = 139992.

The previous prime is 279977. The next prime is 279991. The reversal of 279988 is 889972.

279988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 268324 + 11664 = 518^2 + 108^2 .

It is a congruent number.

It is an unprimeable number.

279988 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, 34995 + ... + 35002.

2²⁷⁹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

279988 is a deficient number, since it is larger than the sum of its proper divisors (209998).

279988 is a wasteful number, since it uses less digits than its factorization.

279988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70001 (or 69999 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 279988 is about 529.1389231572. The cubic root of 279988 is about 65.4203916000.

The spelling of 279988 in words is "two hundred seventy-nine thousand, nine hundred eighty-eight".