Question

3,993,456 Internatioal system ​

Answer 1

there millions,nine hundred and ninety three thousand, four hundred and fifty six

Answer 2

yes

that because the comma " , " is after 3 digits.

but in Indian system the first comma is after 3 digits and the all next comma is after 2-2 digits.


and it is written..
three million nine hundred ninety three thousand four hundred fifty six.
which is international system.

i hope its clear to you.