Adding to 280506 its reverse (605082), we get a palindrome (885588).
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
280506 is an admirable number.
It is a nialpdrome in base 14.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280506.
280506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2280506 is an apocalyptic number.
280506 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.
280506 is a wasteful number, since it uses less digits than its factorization.
280506 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 46756.
The square root of 280506 is about 529.6281714562. The cubic root of 280506 is about 65.4607110494.
The spelling of 280506 in words is "two hundred eighty thousand, five hundred six".