Il numero romano MMMMCDXC nel sistema decimale vale: 4490.
MMMMCDXC in latino si scrive quattuor milia quadringenti nonaginta,
mentre in italiano quattromilaquattrocentonovanta.
MMMMCDLXXI, MMMMCDLXXII, MMMMCDLXXIII, MMMMCDLXXIV, MMMMCDLXXV, MMMMCDLXXVI, MMMMCDLXXVII, MMMMCDLXXVIII, MMMMCDLXXIX, MMMMCDLXXX, MMMMCDLXXXI, MMMMCDLXXXII, MMMMCDLXXXIII, MMMMCDLXXXIV, MMMMCDLXXXV, MMMMCDLXXXVI, MMMMCDLXXXVII, MMMMCDLXXXVIII, MMMMCDLXXXIX, MMMMCDXCI, MMMMCDXCII, MMMMCDXCIII, MMMMCDXCIV, MMMMCDXCV, MMMMCDXCVI, MMMMCDXCVII, MMMMCDXCVIII, MMMMCDXCIX, MMMMD, MMMMDI, MMMMDII, MMMMDIII, MMMMDIV, MMMMDV, MMMMDVI, MMMMDVII, MMMMDVIII, MMMMDIX