Il numero romano MMMCMXC nel sistema decimale vale: 3990.
MMMCMXC in latino si scrive tria milia nongenti nonaginta,
mentre in italiano tremilanovecentonovanta.
MMMCMLXXI, MMMCMLXXII, MMMCMLXXIII, MMMCMLXXIV, MMMCMLXXV, MMMCMLXXVI, MMMCMLXXVII, MMMCMLXXVIII, MMMCMLXXIX, MMMCMLXXX, MMMCMLXXXI, MMMCMLXXXII, MMMCMLXXXIII, MMMCMLXXXIV, MMMCMLXXXV, MMMCMLXXXVI, MMMCMLXXXVII, MMMCMLXXXVIII, MMMCMLXXXIX, MMMCMXCI, MMMCMXCII, MMMCMXCIII, MMMCMXCIV, MMMCMXCV, MMMCMXCVI, MMMCMXCVII, MMMCMXCVIII, MMMCMXCIX, MMMM, MMMMI, MMMMII, MMMMIII, MMMMIV, MMMMV, MMMMVI, MMMMVII, MMMMVIII, MMMMIX