280705039 has 2 divisors, whose sum is σ = 280705040. Its totient is φ = 280705038.

The previous prime is 280705001. The next prime is 280705063. The reversal of 280705039 is 930507082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280705039 - 2⁷ = 280704911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280704995 and 280705013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280702039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140352519 + 140352520.

It is an arithmetic number, because the mean of its divisors is an integer number (140352520).

Almost surely, 2^280705039 is an apocalyptic number.

280705039 is a deficient number, since it is larger than the sum of its proper divisors (1).

280705039 is an equidigital number, since it uses as much as digits as its factorization.

280705039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 280705039 is about 16754.2543552377. The cubic root of 280705039 is about 654.7619040213.

The spelling of 280705039 in words is "two hundred eighty million, seven hundred five thousand, thirty-nine".