Il numero romano MMMCM nel sistema decimale vale: 3900.
MMMCM in latino si scrive tria milia nongenti,
mentre in italiano tremilanovecento.
MMMDCCCLXXXI, MMMDCCCLXXXII, MMMDCCCLXXXIII, MMMDCCCLXXXIV, MMMDCCCLXXXV, MMMDCCCLXXXVI, MMMDCCCLXXXVII, MMMDCCCLXXXVIII, MMMDCCCLXXXIX, MMMDCCCXC, MMMDCCCXCI, MMMDCCCXCII, MMMDCCCXCIII, MMMDCCCXCIV, MMMDCCCXCV, MMMDCCCXCVI, MMMDCCCXCVII, MMMDCCCXCVIII, MMMDCCCXCIX, MMMCMI, MMMCMII, MMMCMIII, MMMCMIV, MMMCMV, MMMCMVI, MMMCMVII, MMMCMVIII, MMMCMIX, MMMCMX, MMMCMXI, MMMCMXII, MMMCMXIII, MMMCMXIV, MMMCMXV, MMMCMXVI, MMMCMXVII, MMMCMXVIII, MMMCMXIX