Red dragon riddle - Floor 18

[strikefighter]

Hi everyone, it's me again!

Does anyone know the answer to the riddle from the red dragon on floor 18?
I'm not bad at math and maybe I'm overthinking things, but I couldn't solve it. I tried several numbers, but everything was wrong.
Anyone who solved it?

[Ranadiel]

If you just want the answer, it is in the guide (search for Red Dragon Floor).

If you want a hint instead, you are looking for the lowest number that can be evenly divided (i.e., no remainder) by 3, 5, 7, and 9.

[strikefighter]

Thanks for the answer! Found it! Maan...what a huge guide!

[Thadius]

For sure, I'm very thankful for this person's hard work making that massive guide! Major props and thanks

[nadera]

315 thats the number your welcome its a pain to find in the guide