Il numero romano MMMDCXXIII nel sistema decimale vale: 3623.
MMMDCXXIII in latino si scrive tria milia sescenti viginti tres,
mentre in italiano tremilaseicentoventitré.
MMMDCIV, MMMDCV, MMMDCVI, MMMDCVII, MMMDCVIII, MMMDCIX, MMMDCX, MMMDCXI, MMMDCXII, MMMDCXIII, MMMDCXIV, MMMDCXV, MMMDCXVI, MMMDCXVII, MMMDCXVIII, MMMDCXIX, MMMDCXX, MMMDCXXI, MMMDCXXII, MMMDCXXIV, MMMDCXXV, MMMDCXXVI, MMMDCXXVII, MMMDCXXVIII, MMMDCXXIX, MMMDCXXX, MMMDCXXXI, MMMDCXXXII, MMMDCXXXIII, MMMDCXXXIV, MMMDCXXXV, MMMDCXXXVI, MMMDCXXXVII, MMMDCXXXVIII, MMMDCXXXIX, MMMDCXL, MMMDCXLI, MMMDCXLII