423.0
Ah, let's take a moment to appreciate the number 423. When we look at it closely, we see that it's closest to the number 420 when rounded to the nearest ten. So, 423 rounded to the nearest ten is 420. Just a little adjustment to make it feel right at home.
400
420
400
Yes
400
2,900,000
1, 3, 9, 47, 141, 423
423 is a composite number. Its prime factorisation is 3 x 3 x 47.
I put the larger number above the smaller number and then I subtract. 719 423 ----- 296
No, it is not a prime number.