Just multiply the raw ADC value (0 .. 4095) by 2442 (using 32 bit unsigned int arithmetic), which gives the answer in microvolts.

When you display the answer (microvolts) you can put in a decimal point, to make it volts.

9,999,999 (microvolts) = 9[.]999999 volts = 9999[.]999 millivolts (if you prefer).

EDIT:

Only the first 5 digits, are useful/correct.

So (ADC * 2442)/1000 using 32 unsigned ints, gives you a directly displayable value, in millivolts.

EDIT2;

As other(s) have mentioned, it is good programming practice to label the constants, and use sensible units within the variables. I've NOT done that here, as I just wanted to show you how to do it, simply.

tl;dr

print this (ensuring 32 bits are used, answers in millvolts using only integers):

(ADC * 2442)/1000