Il numero romano MMMMDCCCXXIII nel sistema decimale vale: 4823.
MMMMDCCCXXIII in latino si scrive quattuor milia octingenti viginti tres,
mentre in italiano quattromilaottocentoventitré.
MMMMDCCCIV, MMMMDCCCV, MMMMDCCCVI, MMMMDCCCVII, MMMMDCCCVIII, MMMMDCCCIX, MMMMDCCCX, MMMMDCCCXI, MMMMDCCCXII, MMMMDCCCXIII, MMMMDCCCXIV, MMMMDCCCXV, MMMMDCCCXVI, MMMMDCCCXVII, MMMMDCCCXVIII, MMMMDCCCXIX, MMMMDCCCXX, MMMMDCCCXXI, MMMMDCCCXXII, MMMMDCCCXXIV, MMMMDCCCXXV, MMMMDCCCXXVI, MMMMDCCCXXVII, MMMMDCCCXXVIII, MMMMDCCCXXIX, MMMMDCCCXXX, MMMMDCCCXXXI, MMMMDCCCXXXII, MMMMDCCCXXXIII, MMMMDCCCXXXIV, MMMMDCCCXXXV, MMMMDCCCXXXVI, MMMMDCCCXXXVII, MMMMDCCCXXXVIII, MMMMDCCCXXXIX, MMMMDCCCXL, MMMMDCCCXLI, MMMMDCCCXLII