280979 has 2 divisors, whose sum is σ = 280980. Its totient is φ = 280978.

The previous prime is 280967. The next prime is 280997. The reversal of 280979 is 979082.

Together with next prime (280997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280979 - 2⁴ = 280963 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280979.

It is not a weakly prime, because it can be changed into another prime (280909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140489 + 140490.

It is an arithmetic number, because the mean of its divisors is an integer number (140490).

2²⁸⁰⁹⁷⁹ is an apocalyptic number.

280979 is a deficient number, since it is larger than the sum of its proper divisors (1).

280979 is an equidigital number, since it uses as much as digits as its factorization.

280979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 280979 is about 530.0745230626. The cubic root of 280979 is about 65.4974845100.

The spelling of 280979 in words is "two hundred eighty thousand, nine hundred seventy-nine".