279891 has 12 divisors (see below), whose sum is σ = 409032. Its totient is φ = 184416.

The previous prime is 279883. The next prime is 279913. The reversal of 279891 is 198972.

It is a happy number.

It is not a de Polignac number, because 279891 - 2³ = 279883 is a prime.

279891 is a lucky number.

It is a nialpdrome in base 6.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279891.

It is not an unprimeable number, because it can be changed into a prime (279991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1120 + ... + 1346.

It is an arithmetic number, because the mean of its divisors is an integer number (34086).

2²⁷⁹⁸⁹¹ is an apocalyptic number.

279891 is a deficient number, since it is larger than the sum of its proper divisors (129141).

279891 is a wasteful number, since it uses less digits than its factorization.

279891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 367 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 279891 is about 529.0472568684. The cubic root of 279891 is about 65.4128359061.

The spelling of 279891 in words is "two hundred seventy-nine thousand, eight hundred ninety-one".