There are 120 of them.
Here are five:
1,357
3,579
5,791
7,913
9,135
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Oh, what a delightful question! With the numbers 6, 7, 8, and 9, there are 24 different ways you can arrange them to create unique four-digit numbers. Each number you make is like a happy little tree in a beautiful forest of possibilities. Just let your imagination flow and enjoy the process of creating something truly special.
The four smallest prime numbers are 2, 3, 5 and 7. Multiply them together. You'll get 210.
1155, 3x5x7x11=1155.
17
No, the number 1155 is divisible by four prime numbers (3, 5, 7, 11).