280543 has 6 divisors (see below), whose sum is σ = 288896. Its totient is φ = 272412.

The previous prime is 280541. The next prime is 280547. The reversal of 280543 is 345082.

It is not a de Polignac number, because 280543 - 2¹ = 280541 is a prime.

It is a Duffinian number.

280543 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2146 + ... + 2272.

2²⁸⁰⁵⁴³ is an apocalyptic number.

280543 is a deficient number, since it is larger than the sum of its proper divisors (8353).

280543 is an equidigital number, since it uses as much as digits as its factorization.

280543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 280543 is about 529.6631004705. The cubic root of 280543 is about 65.4635891100.

The spelling of 280543 in words is "two hundred eighty thousand, five hundred forty-three".