The Roman numeral MCMLXXXIX corresponds to the Arabic number 1989.
MCMLXXXIX = 1989
Symbols are written and read from left to right, from highest to lowest.
If number MCMLXXXIX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1989.
MCMLXXXVIII is number 1988
MCMXC is number 1990
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