280987 has 8 divisors (see below), whose sum is σ = 324576. Its totient is φ = 238272.

The previous prime is 280979. The next prime is 280997. The reversal of 280987 is 789082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280987 - 2³ = 280979 is a prime.

280987 is a lucky 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 (280927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813 + ... + 1105.

It is an arithmetic number, because the mean of its divisors is an integer number (40572).

2²⁸⁰⁹⁸⁷ is an apocalyptic number.

280987 is a deficient number, since it is larger than the sum of its proper divisors (43589).

280987 is a wasteful number, since it uses less digits than its factorization.

280987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 280987 is about 530.0820691176. The cubic root of 280987 is about 65.4981061162.

The spelling of 280987 in words is "two hundred eighty thousand, nine hundred eighty-seven".