278843 has 2 divisors, whose sum is σ = 278844. Its totient is φ = 278842.

The previous prime is 278827. The next prime is 278849. The reversal of 278843 is 348872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278843 - 2⁴ = 278827 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278843.

It is not a weakly prime, because it can be changed into another prime (278849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139421 + 139422.

It is an arithmetic number, because the mean of its divisors is an integer number (139422).

2²⁷⁸⁸⁴³ is an apocalyptic number.

278843 is a deficient number, since it is larger than the sum of its proper divisors (1).

278843 is an equidigital number, since it uses as much as digits as its factorization.

278843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 32.

The square root of 278843 is about 528.0558682564. The cubic root of 278843 is about 65.3310917135.

The spelling of 278843 in words is "two hundred seventy-eight thousand, eight hundred forty-three".