278867 has 2 divisors, whose sum is σ = 278868. Its totient is φ = 278866.

The previous prime is 278849. The next prime is 278879. The reversal of 278867 is 768872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278867 - 2⁸ = 278611 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278867.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278867.

It is not a weakly prime, because it can be changed into another prime (278807) 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 as a sum of consecutive naturals, namely, 139433 + 139434.

It is an arithmetic number, because the mean of its divisors is an integer number (139434).

2²⁷⁸⁸⁶⁷ is an apocalyptic number.

278867 is a deficient number, since it is larger than the sum of its proper divisors (1).

278867 is an equidigital number, since it uses as much as digits as its factorization.

278867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 278867 is about 528.0785926356. The cubic root of 278867 is about 65.3329660075.

The spelling of 278867 in words is "two hundred seventy-eight thousand, eight hundred sixty-seven".