In the given codes, the numbers are coded as shown :
 

1	3	4	7	9	5	2	6	8
A	Q	F	J	L	D	M	P	N

i.e., 3 as Q,
9 as L,
6 as P,
8 as N,
2 as M  and
4 as F.
So, 396824 is coded as QLPNMF.