280873 has 4 divisors (see below), whose sum is σ = 282820. Its totient is φ = 278928.

The previous prime is 280871. The next prime is 280879. The reversal of 280873 is 378082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378082 = 2 ⋅189041.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 94249 = 432^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 280873 - 2¹ = 280871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280871) 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 in 3 ways as a sum of consecutive naturals, for example, 738 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (70705).

2²⁸⁰⁸⁷³ is an apocalyptic number.

It is an amenable number.

280873 is a deficient number, since it is larger than the sum of its proper divisors (1947).

280873 is a wasteful number, since it uses less digits than its factorization.

280873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 280873 is about 529.9745276898. The cubic root of 280873 is about 65.4892471131.

The spelling of 280873 in words is "two hundred eighty thousand, eight hundred seventy-three".