It is 99984.
99882
There are 180 3-digit numbers divisible by five.
555 also 110 is divisible by five and the answer is 22
33333
12008
11,115
24000
100
10,002
15000
The highest six-digit number divisible by 3, 4, and 5 is 999960.
You just need a 4 digit number divisible by 5x9 ie by 45, so 4500 will do.