A 1000-digit number is called a "millidigit" number. The prefix "milli-" denotes one thousandth, so a millidigit number is a number consisting of 1000 digits. In the realm of mathematics, such large numbers are often encountered in fields like cryptography, number theory, and computer science.
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If your asking in a digit it's called a 4 digit number and it is the smallest 4 digit number
The smallest four digit whole number is 1000.
No. 1000 has 4 digits and is the smallest 4-digit number. The smallest 3-digit number is 100.
It is called a 28-digit number!
The short answer is 1000. This is very easy to visualise: Simply consider each number in the combination to be a digit in a decimal number. We then end up with a three-digit number. Such a three-digit number ranges in value from 000 to 999, or 1000 unique combinations.
1000 is the first such number. There are 450 of them, in all.