280387879 has 2 divisors, whose sum is σ = 280387880. Its totient is φ = 280387878.

The previous prime is 280387859. The next prime is 280387897. The reversal of 280387879 is 978783082.

Together with next prime (280387897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280387879 - 2¹⁷ = 280256807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280387859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140193939 + 140193940.

It is an arithmetic number, because the mean of its divisors is an integer number (140193940).

Almost surely, 2^280387879 is an apocalyptic number.

280387879 is a deficient number, since it is larger than the sum of its proper divisors (1).

280387879 is an equidigital number, since it uses as much as digits as its factorization.

280387879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The square root of 280387879 is about 16744.7866215130. The cubic root of 280387879 is about 654.5152126349.

The spelling of 280387879 in words is "two hundred eighty million, three hundred eighty-seven thousand, eight hundred seventy-nine".