No, you'd have to write your own. I'd suggest converting the number to a string ie "1e-7" then using the various slice and dice text functions available to take everything before the 'e', strip the decimal point out, append the right number of zeros either to the left or right and, if necessary, re-append the decimal point.
eg
1.234e-7 = 0.0000001234
1.234e-7, take everything before the 'e'
1.234, strip out the decimal point
1234, append the right number of zeros (7), to the left (-)
00000001234, re-append the decimal point (-)
0.0000001234