280867 has 4 divisors (see below), whose sum is σ = 288496. Its totient is φ = 273240.

The previous prime is 280859. The next prime is 280871. The reversal of 280867 is 768082.

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 280867 - 2³ = 280859 is a prime.

It is a Duffinian number.

280867 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (280817) 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, 3759 + ... + 3832.

It is an arithmetic number, because the mean of its divisors is an integer number (72124).

2²⁸⁰⁸⁶⁷ is an apocalyptic number.

280867 is a deficient number, since it is larger than the sum of its proper divisors (7629).

280867 is an equidigital number, since it uses as much as digits as its factorization.

280867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 280867 is about 529.9688670101. The cubic root of 280867 is about 65.4887807834.

The spelling of 280867 in words is "two hundred eighty thousand, eight hundred sixty-seven".