278279 has 2 divisors, whose sum is σ = 278280. Its totient is φ = 278278.

The previous prime is 278269. The next prime is 278321. The reversal of 278279 is 972872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278279 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139139 + 139140.

It is an arithmetic number, because the mean of its divisors is an integer number (139140).

2²⁷⁸²⁷⁹ is an apocalyptic number.

278279 is a deficient number, since it is larger than the sum of its proper divisors (1).

278279 is an equidigital number, since it uses as much as digits as its factorization.

278279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 278279 is about 527.5215635403. The cubic root of 278279 is about 65.2870148121.

The spelling of 278279 in words is "two hundred seventy-eight thousand, two hundred seventy-nine".