The least number that rounds to 4000 to 1 sig fig is 3500
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4252 to 1 significant figure is 4000.
4000
4000 has between 1 and 4 significant figures: if it is a rounded number, then it could have been 3999.9, for example, which would be rounded to 4000 to 1, 2, 3 or 4 significant figures.
If you mean what you say then it's 4000 x 3/2, ie 6000. If you mean what is 2/3 OF 4000, then it's 4000 x 2/3 ie 8000/3 or 2666 and 2/3
4000