many numbers could be rounded to 4000 but a example is 3978 rounded to the thousands
4000
To the nearest 4000: 5999
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.
4000
4000
4000
It is then 4000 when rounded to the nearest thousand
No number if rounded to the nearest thousand would round to 3600. If you had to round the number 3600 to the nearest thousand, it would be approximately equal to 4000.
4000
4000