The complement of 2 147483647 is 0111111. 438+01111111equals.
10000000 00000000 00000000 00000000
The most significant bit of 1 is the sign bit and becomes negative.
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000