280559 has 4 divisors (see below), whose sum is σ = 282504. Its totient is φ = 278616.

The previous prime is 280549. The next prime is 280561. The reversal of 280559 is 955082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280559 - 2⁸ = 280303 is a prime.

It is a Duffinian 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 (280549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737 + ... + 1050.

It is an arithmetic number, because the mean of its divisors is an integer number (70626).

2²⁸⁰⁵⁵⁹ is an apocalyptic number.

280559 is a deficient number, since it is larger than the sum of its proper divisors (1945).

280559 is a wasteful number, since it uses less digits than its factorization.

280559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 280559 is about 529.6782041957. The cubic root of 280559 is about 65.4648335984.

It can be divided in two parts, 280 and 559, that multiplied together give a triangular number (156520 = T₅₅₉).

The spelling of 280559 in words is "two hundred eighty thousand, five hundred fifty-nine".