278807 has 2 divisors, whose sum is σ = 278808. Its totient is φ = 278806.

The previous prime is 278801. The next prime is 278809. The reversal of 278807 is 708872.

It is a happy number.

278807 is nontrivially palindromic in base 13.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278807 - 2⁶ = 278743 is a prime.

Together with 278809, 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 278807.

It is not a weakly prime, because it can be changed into another prime (278801) 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, 139403 + 139404.

It is an arithmetic number, because the mean of its divisors is an integer number (139404).

2²⁷⁸⁸⁰⁷ is an apocalyptic number.

278807 is a deficient number, since it is larger than the sum of its proper divisors (1).

278807 is an equidigital number, since it uses as much as digits as its factorization.

278807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 278807 is about 528.0217798538. The cubic root of 278807 is about 65.3282800710.

The spelling of 278807 in words is "two hundred seventy-eight thousand, eight hundred seven".