The largest 4 digit number in base 8 is 77778 (= 409510).
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8888
9999
-4
The four digit multiples of 1234 are:1234 (1234x1)2468 (1234x2)3702 (1234x3)4936 (1234x4)6170 (1234x5)7404 (1234x6)8638 (1234x7)9872 (1234x8)Multiplying 1234 by 9 give the 5 digit number 11106, so the largest 4 digit multiple of 1234 is 9872.
9999 is the 4-digit number and 999 is the 3-digit number.