280843 has 2 divisors, whose sum is σ = 280844. Its totient is φ = 280842.

The previous prime is 280837. The next prime is 280859. The reversal of 280843 is 348082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280843 - 2⁵ = 280811 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁸ + 8² + 8² + 0 + 4⁷ + 3⁷ .

It is not a weakly prime, because it can be changed into another prime (280883) by changing a digit.

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 as a sum of consecutive naturals, namely, 140421 + 140422.

It is an arithmetic number, because the mean of its divisors is an integer number (140422).

2²⁸⁰⁸⁴³ is an apocalyptic number.

280843 is a deficient number, since it is larger than the sum of its proper divisors (1).

280843 is an equidigital number, since it uses as much as digits as its factorization.

280843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 280843 is about 529.9462236869. The cubic root of 280843 is about 65.4869153981.

The spelling of 280843 in words is "two hundred eighty thousand, eight hundred forty-three".