Il numero romano CCXCVII nel sistema decimale vale: 297.
CCXCVII in latino si scrive ducenti nonaginta septem,
mentre in italiano duecentonovantasette.
CCLXXVIII, CCLXXIX, CCLXXX, CCLXXXI, CCLXXXII, CCLXXXIII, CCLXXXIV, CCLXXXV, CCLXXXVI, CCLXXXVII, CCLXXXVIII, CCLXXXIX, CCXC, CCXCI, CCXCII, CCXCIII, CCXCIV, CCXCV, CCXCVI, CCXCVIII, CCXCIX, CCC, CCCI, CCCII, CCCIII, CCCIV, CCCV, CCCVI, CCCVII, CCCVIII, CCCIX, CCCX, CCCXI, CCCXII, CCCXIII, CCCXIV, CCCXV, CCCXVI