There are one thousand (1000) kilobytes in one (1) megabyte.
First I want to make sure wae are talking about the same thing KB is Kilobytes and Kb is kilobits MB is Megabytes and Mb is Megabits GB is Gigabytes and Gb is Gigabits that being said ...
50MB is 51200KB
398.403 MB or .398 GB
40000