280143 has 12 divisors (see below), whose sum is σ = 428688. Its totient is φ = 175680.

The previous prime is 280139. The next prime is 280183. The reversal of 280143 is 341082.

It is a happy number.

It is not a de Polignac number, because 280143 - 2² = 280139 is a prime.

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 280143.

It is not an unprimeable number, because it can be changed into a prime (280103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 763 + ... + 1068.

It is an arithmetic number, because the mean of its divisors is an integer number (35724).

2²⁸⁰¹⁴³ is an apocalyptic number.

280143 is a deficient number, since it is larger than the sum of its proper divisors (148545).

280143 is a wasteful number, since it uses less digits than its factorization.

280143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1851 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 280143 is about 529.2853672642. The cubic root of 280143 is about 65.4324615103.

The spelling of 280143 in words is "two hundred eighty thousand, one hundred forty-three".