29,000,000 is M 29,000 times in a row, unless there is a numeral for a number greater than 1,000.
Improved Answer:-
It is: ((MMDCCC)) which means 10*1000*2900 = 29,000,000
Note that 29 in Roman numerals was once XXVIIII as can be seen in the ruins of the Coliseum in Rome.
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Nine million = 9,000,000
(M)(DCCLXII)CMXXI Numerals in brackets indicate multiplication by a thousand. Hence: (M) = 1000*1000 = 1,000,000 (DCCLXII) = 1000*762 = 762,000 CMXXI = 921
IX
The Roman numeral for nine is IX. X is 10 and I is 1. When the I is before the X you subtract.
IX