The factors of the number 399,168 are: 1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 14, 16, 18, 21, 22, 24, 27, 28, 32, 33, 36, 42, 44, 48, 54, 56, 63, 64, 66, 72, 77, 81, 84, 88, 96, 99, 108, 112, 126, 132, 144, 154, 162, 168, 176, 189, 192, 198, 216, 224, 231, 252, 264, 288, 297, 308, 324, 336, 352, 378, 396, 432, 448, 462, 504, 528, 567, 576, 594, 616, 648, 672, 693, 704, 756, 792, 864, 891, 924, 1008, 1056, 1134, 1188, 1232, 1296, 1344, 1386, 1512, 1584, 1728, 1782, 1848, 2016, 2079, 2112, 2268, 2376, 2464, 2592, 2772, 3024, 3168, 3564, 3696, 4032, 4158, 4536, 4752, 4928, 5184, 5544, 6048, 6237, 6336, 7128, 7392, 8316, 9072, 9504, 11088, 12096, 12474, 14256, 14784, 16632, 18144, 19008, 22176, 24948, 28512, 33264, 36288, 44352, 49896, 57024, 66528, 99792, 133056, 199584, 399168.
If you add them up, you will get the total of 1,475,232.