It is a happy number.
It is an ABA number since it can be written as A⋅BA, here for A=2, B=43.
It is an Ulam number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a plaindrome in base 15.
It is a nialpdrome in base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3698.
23698 is an apocalyptic number.
3698 is an equidigital number, since it uses as much as digits as its factorization.
3698 is an odious number, because the sum of its binary digits is odd.
The square root of 3698 is about 60.8111831820. The cubic root of 3698 is about 15.4640164240.
Adding to 3698 its product of digits (1296), we get a palindrome (4994).
The spelling of 3698 in words is "three thousand, six hundred ninety-eight".