Il numero romano MCCCXC nel sistema decimale vale: 1390.
MCCCXC in latino si scrive mille trecenti nonaginta,
mentre in italiano milletrecentonovanta.
MCCCLXXI, MCCCLXXII, MCCCLXXIII, MCCCLXXIV, MCCCLXXV, MCCCLXXVI, MCCCLXXVII, MCCCLXXVIII, MCCCLXXIX, MCCCLXXX, MCCCLXXXI, MCCCLXXXII, MCCCLXXXIII, MCCCLXXXIV, MCCCLXXXV, MCCCLXXXVI, MCCCLXXXVII, MCCCLXXXVIII, MCCCLXXXIX, MCCCXCI, MCCCXCII, MCCCXCIII, MCCCXCIV, MCCCXCV, MCCCXCVI, MCCCXCVII, MCCCXCVIII, MCCCXCIX, MCD, MCDI, MCDII, MCDIII, MCDIV, MCDV, MCDVI, MCDVII, MCDVIII, MCDIX