The factors of the number 1,594,404 are: 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 19, 21, 27, 28, 36, 37, 38, 42, 54, 57, 63, 74, 76, 81, 84, 108, 111, 114, 126, 133, 148, 162, 171, 189, 222, 228, 252, 259, 266, 324, 333, 342, 378, 399, 444, 513, 518, 532, 567, 666, 684, 703, 756, 777, 798, 999, 1026, 1036, 1134, 1197, 1332, 1406, 1539, 1554, 1596, 1998, 2052, 2109, 2268, 2331, 2394, 2812, 2997, 3078, 3108, 3591, 3996, 4218, 4662, 4788, 4921, 5994, 6156, 6327, 6993, 7182, 8436, 9324, 9842, 10773, 11988, 12654, 13986, 14364, 14763, 18981, 19684, 20979, 21546, 25308, 27972, 29526, 37962, 41958, 43092, 44289, 56943, 59052, 75924, 83916, 88578, 113886, 132867, 177156, 227772, 265734, 398601, 531468, 797202, 1594404.
If you add them up, you will get the total of 5,149,760.