The letters of the word ‘MANKIND’ are written in all possible orders and arranged in serial order as in an English dictionary. Then the sum of the digits of the rank of the word ‘MANKIND’ is_______.

MANKIND ( Given word)
ADIKMNN (alphabetical order)
$A\dots \dots \dots \dots \dots \Rightarrow \frac{6!}{2!}=360$
$\begin{array}{r}\mathrm{D}\dots \dots \dots \dots \dots \Rightarrow \frac{6!}{2!}=360\\ \mathrm{I}\dots \dots \dots \cdots \cdots \cdots \Rightarrow \frac{6!}{2!}=360\end{array}$
$\begin{array}{r}\mathrm{K}\dots \dots \dots \dots \dots \Rightarrow \frac{6!}{2!}=360\\ \mathrm{MAD}\dots \dots \dots \dots \Rightarrow \frac{4!}{2!}=12\\ \mathrm{MAI}\dots \dots \dots \dots \Rightarrow \frac{4!}{2!}=12\end{array}$
$\begin{array}{l}\mathrm{MAK}\dots \dots \dots .\Rightarrow \frac{4!}{2!}=12\\ \mathrm{MAND}\dots \dots \dots \Rightarrow 3!=6\\ \mathrm{MANI}\dots \dots \dots \Rightarrow 3!=6\\ \mathrm{MANKD}\dots \dots .\Rightarrow 2!=2\\ \mathrm{MANKID}\dots \dots \Rightarrow 1!=1\\ \mathrm{MANKIND}=\frac{1}{\mathrm{rank}=1492}\end{array}$

sum of the digits=1+4+9+2=16