280344 has 16 divisors (see below), whose sum is σ = 700920. Its totient is φ = 93440.

The previous prime is 280339. The next prime is 280351. The reversal of 280344 is 443082.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 280344.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280344.

It is an unprimeable number.

280344 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5817 + ... + 5864.

2²⁸⁰³⁴⁴ is an apocalyptic number.

280344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

280344 is an abundant number, since it is smaller than the sum of its proper divisors (420576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280344 is a wasteful number, since it uses less digits than its factorization.

280344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11690 (or 11686 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 280344 is about 529.4752118844. The cubic root of 280344 is about 65.4481068302.

The spelling of 280344 in words is "two hundred eighty thousand, three hundred forty-four".