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Q: What is the unit digit of the number 2 to the 400 power?

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I would just call it a "400-digit number".

400

200*200=400 200+200=400

I'm sure there are more than 2 prime numbers that are 400 digits long.

537

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I would just call it a "400-digit number".

9,999 is the greatest four digit number.

All of the four-digit multiples of 400 end in 00.

400

The answer is vague but correct . Take any prime number and any other number whose combined digit length is 401 and their product will generate a 400 or a 401 digit number.

It is 400, exactly as in the question. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.

400

200*200=400 200+200=400

Yes.

400/4= 100 and 800/4=200

Either 4000, 400, 70 or 6.

400

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