The factors of the number 3,991,104 are: 1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 32, 36, 39, 41, 48, 52, 64, 72, 78, 82, 96, 104, 117, 123, 144, 156, 164, 169, 192, 208, 234, 246, 288, 312, 328, 338, 369, 416, 468, 492, 507, 533, 576, 624, 656, 676, 738, 832, 936, 984, 1014, 1066, 1248, 1312, 1352, 1476, 1521, 1599, 1872, 1968, 2028, 2132, 2496, 2624, 2704, 2952, 3042, 3198, 3744, 3936, 4056, 4264, 4797, 5408, 5904, 6084, 6396, 6929, 7488, 7872, 8112, 8528, 9594, 10816, 11808, 12168, 12792, 13858, 16224, 17056, 19188, 20787, 23616, 24336, 25584, 27716, 32448, 34112, 38376, 41574, 48672, 51168, 55432, 62361, 76752, 83148, 97344, 102336, 110864, 124722, 153504, 166296, 221728, 249444, 307008, 332592, 443456, 498888, 665184, 997776, 1330368, 1995552, 3991104.
If you add them up, you will get the total of 12,689,586.