The GCD of given numbers is 1.
Step 1 : Find prime factorization of each number.
$$\begin{aligned}13966 =& 2\cdot6983\\[8pt]14727 =& 3\cdot4909\\[8pt]\end{aligned}$$(view steps on how to factor 13966 and 14727. )
Step 2 : Put a box around factors that are common for all numbers:
$$\begin{aligned}13966 =& 2\cdot6983\\[8pt]14727 =& 3\cdot4909\\[8pt]\end{aligned}$$Note that in this example numbers do not have any common factors.
Step 3 : Multiply the boxed numbers together:
Since there is no boxed numbers we conclude that $~\color{blue}{ \text{GCD = 1} } $.
This solution can be visualized using a Venn diagram.
The GCD equals the product of the numbers at the intersection.