It is a happy number.
It is a semiprime because it is the product of two primes.
It is a Curzon number.
It is a plaindrome in base 13.
It is a nialpdrome in base 8 and base 16.
It is an unprimeable number.
3506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
3506 is a wasteful number, since it uses less digits than its factorization.
3506 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1755.
The square root of 3506 is about 59.2114853723. The cubic root of 3506 is about 15.1916158749.
Adding to 3506 its reverse (6053), we get a palindrome (9559).
The spelling of 3506 in words is "three thousand, five hundred six".