279940 has 12 divisors (see below), whose sum is σ = 587916. Its totient is φ = 111968.

The previous prime is 279919. The next prime is 279941. The reversal of 279940 is 49972.

It can be written as a sum of positive squares in 2 ways, for example, as 118336 + 161604 = 344^2 + 402^2 .

It is not an unprimeable number, because it can be changed into a prime (279941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6979 + ... + 7018.

It is an arithmetic number, because the mean of its divisors is an integer number (48993).

279940 is a Friedman number, since it can be written as 4+(9-9^0-2)^7, using all its digits and the basic arithmetic operations.

2²⁷⁹⁹⁴⁰ is an apocalyptic number.

279940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

279940 is an abundant number, since it is smaller than the sum of its proper divisors (307976).

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

279940 is a wasteful number, since it uses less digits than its factorization.

279940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14006 (or 14004 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 279940 is about 529.0935645044. The cubic root of 279940 is about 65.4166529181.

The spelling of 279940 in words is "two hundred seventy-nine thousand, nine hundred forty".