3000 (three thousand) is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English (when “and” is required from 101 forward). (Wikipedia)

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3000 in Words can be written as Three Thousand. If you have saved 3000 dollars, then you can write, “I have just saved Three Thousand dollars.” Three Thousand is the cardinal number word of 3000 which denotes a quantity.

How to Write 3000 in Words?
Using the place value chart we identify the place for each digit in the given number and write the number name. For 3000 we see that the digits in units = 0, tens = 0, hundreds = 0, thousands = 3. Therefore 3000 in words is written as Three Thousand.  (cuemath.com)

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3000 days is 4320000 minutes, 259200000 seconds, and a little more than 428 weeks.