280888939 has 2 divisors, whose sum is σ = 280888940. Its totient is φ = 280888938.

The previous prime is 280888847. The next prime is 280888961. The reversal of 280888939 is 939888082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280888939 - 2¹⁵ = 280856171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280888939.

It is not a weakly prime, because it can be changed into another prime (280888969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140444469 + 140444470.

It is an arithmetic number, because the mean of its divisors is an integer number (140444470).

Almost surely, 2^280888939 is an apocalyptic number.

280888939 is a deficient number, since it is larger than the sum of its proper divisors (1).

280888939 is an equidigital number, since it uses as much as digits as its factorization.

280888939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 55.

The square root of 280888939 is about 16759.7416149534. The cubic root of 280888939 is about 654.9048588575.

The spelling of 280888939 in words is "two hundred eighty million, eight hundred eighty-eight thousand, nine hundred thirty-nine".