280408879 has 2 divisors, whose sum is σ = 280408880. Its totient is φ = 280408878.

The previous prime is 280408871. The next prime is 280408889. The reversal of 280408879 is 978804082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280408879 - 2³ = 280408871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280408871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140204439 + 140204440.

It is an arithmetic number, because the mean of its divisors is an integer number (140204440).

Almost surely, 2^280408879 is an apocalyptic number.

280408879 is a deficient number, since it is larger than the sum of its proper divisors (1).

280408879 is an equidigital number, since it uses as much as digits as its factorization.

280408879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 280408879 is about 16745.4136706144. The cubic root of 280408879 is about 654.5315524714.

The spelling of 280408879 in words is "two hundred eighty million, four hundred eight thousand, eight hundred seventy-nine".