280986 has 8 divisors (see below), whose sum is σ = 561984. Its totient is φ = 93660.

The previous prime is 280979. The next prime is 280997. The reversal of 280986 is 689082.

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

280986 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23410 + ... + 23421.

It is an arithmetic number, because the mean of its divisors is an integer number (70248).

2²⁸⁰⁹⁸⁶ is an apocalyptic number.

280986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280986 is a wasteful number, since it uses less digits than its factorization.

280986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46836.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 280986 is about 530.0811258666. The cubic root of 280986 is about 65.4980284161.

The spelling of 280986 in words is "two hundred eighty thousand, nine hundred eighty-six".