280243 has 2 divisors, whose sum is σ = 280244. Its totient is φ = 280242.

The previous prime is 280229. The next prime is 280249. The reversal of 280243 is 342082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280243 - 2⁹ = 279731 is a prime.

It is a super-2 number, since 2×280243² = 157072278098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280243.

It is not a weakly prime, because it can be changed into another prime (280249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140121 + 140122.

It is an arithmetic number, because the mean of its divisors is an integer number (140122).

2²⁸⁰²⁴³ is an apocalyptic number.

280243 is a deficient number, since it is larger than the sum of its proper divisors (1).

280243 is an equidigital number, since it uses as much as digits as its factorization.

280243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 280243 is about 529.3798258340. The cubic root of 280243 is about 65.4402461866.

The spelling of 280243 in words is "two hundred eighty thousand, two hundred forty-three".