The absolute largest number possible that can be made up of six digits is the number 999,999. This is can also be described as the number "one short of a million". Verbally (or long-hand), this number is written as nine hundred and ninety nine thousand, nine hundred and ninety nine.

Alternatively, the smallest six-digit numeral that exists is the number 100,000 (one hundred thousand), as any lower, and it becomes a five-digit number. Other interesting numbers:

Alternatively, the smallest six-digit numeral that exists is the number 100,000 (one hundred thousand), as any lower, and it becomes a five-digit number. Other interesting numbers:

- The largest prime number that can be made with six digits is 999,983 (nine hundred and ninety nine thousand, nine hundred and eighty three). Prime numbers are numbers that are only divisible (another number going an even number of times into it) by the number 1 and the number itself.
- 262144 is the result of a power of 2. When 2 is multiplied by itself 18 times, 262144 is the result. It is known as a superperfect number, and an exponential factorial of 4. 2 to the power of 19 comes out at 524288.
- 720720 is a colossally abundant number. This means it is the smallest number divisible by all the numbers from 1 through to 16.