#1440000#
#color(blue)1color(red)(440000)#
There #color(blue)1# gets written first, followed by a decimal and the remaining numbers. There are #color(red)6# digits following the #color(blue)1#, which will be the power of #10#. We keep non-zeroes (#color(orange)44#) explicitly to ensure that the original number and the number in scientific notation have equal significant figures.
#color(blue)(1).color(orange)(44) xx 10^color(red)6#