279945 has 12 divisors (see below), whose sum is σ = 485316. Its totient is φ = 149280.

The previous prime is 279941. The next prime is 279949. The reversal of 279945 is 549972.

It is an interprime number because it is at equal distance from previous prime (279941) and next prime (279949).

It can be written as a sum of positive squares in 2 ways, for example, as 46656 + 233289 = 216^2 + 483^2 .

It is not a de Polignac number, because 279945 - 2² = 279941 is a prime.

It is a plaindrome in base 16.

It is a zygodrome in base 7.

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

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 11 ways as a sum of consecutive naturals, for example, 3066 + ... + 3155.

It is an arithmetic number, because the mean of its divisors is an integer number (40443).

279945 is a Friedman number, since it can be written as 9+(4+2)^(9-7+5), using all its digits and the basic arithmetic operations.

2²⁷⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

279945 is a deficient number, since it is larger than the sum of its proper divisors (205371).

279945 is a wasteful number, since it uses less digits than its factorization.

279945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232 (or 6229 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 279945 is about 529.0982895455. The cubic root of 279945 is about 65.4170423841.

The spelling of 279945 in words is "two hundred seventy-nine thousand, nine hundred forty-five".