4
The number 4 in a dream represents balance, stability, and sacrifice of negativity. When you see it in a dream it's usually pointing to something negative in your life that is being removed. A removal of chaos or unpredictability.
The reason 4 represents balance is because like the legs of a chair you need four of them to stay balanced or secure.
Example: A man dreamed of being given $400 dollars. In waking life a vitamin supplement was recommended to him that helped him stabilize a serious health condition.