The Roman numeral CCCXCVIII corresponds to the Arabic number 398.
CCCXCVIII = 398
Symbols are written and read from left to right, from highest to lowest.
If number CCCXCVIII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 398.
CCCXCVII is number 397
CCCXCIX is number 399
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