Il numero romano MMMMDCCXXIII nel sistema decimale vale: 4723.
MMMMDCCXXIII in latino si scrive quattuor milia septingenti viginti tres,
mentre in italiano quattromilasettecentoventitré.
MMMMDCCIV, MMMMDCCV, MMMMDCCVI, MMMMDCCVII, MMMMDCCVIII, MMMMDCCIX, MMMMDCCX, MMMMDCCXI, MMMMDCCXII, MMMMDCCXIII, MMMMDCCXIV, MMMMDCCXV, MMMMDCCXVI, MMMMDCCXVII, MMMMDCCXVIII, MMMMDCCXIX, MMMMDCCXX, MMMMDCCXXI, MMMMDCCXXII, MMMMDCCXXIV, MMMMDCCXXV, MMMMDCCXXVI, MMMMDCCXXVII, MMMMDCCXXVIII, MMMMDCCXXIX, MMMMDCCXXX, MMMMDCCXXXI, MMMMDCCXXXII, MMMMDCCXXXIII, MMMMDCCXXXIV, MMMMDCCXXXV, MMMMDCCXXXVI, MMMMDCCXXXVII, MMMMDCCXXXVIII, MMMMDCCXXXIX, MMMMDCCXL, MMMMDCCXLI, MMMMDCCXLII