279878 has 4 divisors (see below), whose sum is σ = 419820. Its totient is φ = 139938.

The previous prime is 279863. The next prime is 279883. The reversal of 279878 is 878972.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 6.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279878.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 69968 + ... + 69971.

It is an arithmetic number, because the mean of its divisors is an integer number (104955).

2²⁷⁹⁸⁷⁸ is an apocalyptic number.

279878 is a deficient number, since it is larger than the sum of its proper divisors (139942).

279878 is a wasteful number, since it uses less digits than its factorization.

279878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139941.

The product of its digits is 56448, while the sum is 41.

The square root of 279878 is about 529.0349704887. The cubic root of 279878 is about 65.4118231546.

The spelling of 279878 in words is "two hundred seventy-nine thousand, eight hundred seventy-eight".