5,454 and 5,400 and many more (try adding and subtracting 54 from the numbers to get a larger variety)
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2400
A 4-digit number divisible by both 5 and 9 must be divisible by their least common multiple, which is 45. To find a 4-digit number divisible by 45, we need to find a number that ends in 0 and is divisible by 45. The smallest 4-digit number that fits these criteria is 1005 (45 x 22 = 990, and adding 15 gives us 1005).
9990 is one such number.
Any number whose last digit is 0 would be divisible by both these numbers. 1000, 1010, 1020...
smallest 4-digit number divisible by 2 = 1000