280489 has 8 divisors (see below), whose sum is σ = 313632. Its totient is φ = 248640.

The previous prime is 280487. The next prime is 280499. The reversal of 280489 is 984082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280489 - 2¹ = 280487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280489.

It is not an unprimeable number, because it can be changed into a prime (280487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (39204).

2²⁸⁰⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

280489 is a deficient number, since it is larger than the sum of its proper divisors (33143).

280489 is a wasteful number, since it uses less digits than its factorization.

280489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 280489 is about 529.6121222178. The cubic root of 280489 is about 65.4593886124.

The spelling of 280489 in words is "two hundred eighty thousand, four hundred eighty-nine".