Il numero romano MMDCCXXIII nel sistema decimale vale: 2723.
MMDCCXXIII in latino si scrive duo milia septingenti viginti tres,
mentre in italiano duemilasettecentoventitré.
MMDCCIV, MMDCCV, MMDCCVI, MMDCCVII, MMDCCVIII, MMDCCIX, MMDCCX, MMDCCXI, MMDCCXII, MMDCCXIII, MMDCCXIV, MMDCCXV, MMDCCXVI, MMDCCXVII, MMDCCXVIII, MMDCCXIX, MMDCCXX, MMDCCXXI, MMDCCXXII, MMDCCXXIV, MMDCCXXV, MMDCCXXVI, MMDCCXXVII, MMDCCXXVIII, MMDCCXXIX, MMDCCXXX, MMDCCXXXI, MMDCCXXXII, MMDCCXXXIII, MMDCCXXXIV, MMDCCXXXV, MMDCCXXXVI, MMDCCXXXVII, MMDCCXXXVIII, MMDCCXXXIX, MMDCCXL, MMDCCXLI, MMDCCXLII