I divisori di 9998991 sono 16, elencati qui di seguito: 1; 3; 9; 27; 37; 111; 333; 999; 10009; 30027; 90081; 270243; 370333; 1110999; 3332997; 9998991
9998972, 9998973, 9998974, 9998975, 9998976, 9998977, 9998978, 9998979, 9998980, 9998981, 9998982, 9998983, 9998984, 9998985, 9998986, 9998987, 9998988, 9998989, 9998990, 9998992, 9998993, 9998994, 9998995, 9998996, 9998997, 9998998, 9998999, 9999000, 9999001, 9999002, 9999003, 9999004, 9999005, 9999006, 9999007, 9999008, 9999009, 9999010