C = 100, D = 500 but CD = 100 less than 500, which is 400. I = 1 and X = 10 but IX = 1 less than 10, which is 9, so the whole number CDIX means 409.
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CDIX
409
LIXImproved Answer:-In todays notation of Roman numerals: 409 = CDIX
It represents 409 in today's notation of Roman numerals
In today's modern notation it is (IX)CDIX Numerals in brackets denotes multiplication by a thousand. So: 9*1000+400+9 = 9409