The number 1,563,385 rounded off to the nearest million becomes

1,563,385 lies between 1,000,000 and 2,000,000
The number halfway between those is 1,500,000 and since our number is greater than that, it is closer to 2,000,000   (two million).

The number to the right of the millions place (the hundred-thousands place) is where you should look.  5 or more - raise it to the next million.  4 or less - bring it down to the million before.

1,563,385

Ibelieve that c. recording would work best.