278879 has 2 divisors, whose sum is σ = 278880. Its totient is φ = 278878.

The previous prime is 278867. The next prime is 278881. The reversal of 278879 is 978872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278879 - 2⁸ = 278623 is a prime.

It is a Sophie Germain prime.

Together with 278881, it forms a pair of twin primes.

It is a Chen prime.

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 278879.

It is not a weakly prime, because it can be changed into another prime (278809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139439 + 139440.

It is an arithmetic number, because the mean of its divisors is an integer number (139440).

2²⁷⁸⁸⁷⁹ is an apocalyptic number.

278879 is a deficient number, since it is larger than the sum of its proper divisors (1).

278879 is an equidigital number, since it uses as much as digits as its factorization.

278879 is an odious number, because the sum of its binary digits is odd.

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

The square root of 278879 is about 528.0899544585. The cubic root of 278879 is about 65.3339031141. Note that the first 3 decimals are identical.

The spelling of 278879 in words is "two hundred seventy-eight thousand, eight hundred seventy-nine".