3686 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a plaindrome in base 15.
It is a nialpdrome in base 16.
It is a congruent number.
It is an unprimeable number.
3686 is a wasteful number, since it uses less digits than its factorization.
3686 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 118.
The square root of 3686 is about 60.7124369466. The cubic root of 3686 is about 15.4472714012.
Subtracting from 3686 its sum of digits (23), we obtain a palindrome (3663).
The spelling of 3686 in words is "three thousand, six hundred eighty-six".