The Roman numeral MMMCMXCIX corresponds to the Arabic number 3999.
MMMCMXCIX = 3999
Symbols are written and read from left to right, from highest to lowest.
If number MMMCMXCIX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 3999.
MMMCMXCVIII is number 3998
IV is number 4000
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