The answer depends on the extent of rounding. To the nearest whole number, it is 12400. To the nearest million, it is zero.
10000
12400
1.24 × 104
It depends on rounded up to what degree. Rounded up to the nearest ten, it is 0.
1.24*104 = 12400
12400
12400
You would round up: 12400
12400
10000
12400
12400
Also 12400
12400 is already an integer.
12400
8700
The number 12400 is "twelve thousand four hundred."