It is: 1,200,000,000 or as 1.2*10^9 in scientific notation
To write 120 million dollars in numbers, you would express it as $120,000,000. The number is composed of 120 followed by six zeros, which represents the million unit.
120
120 is an integer. Integers aren't fractions or mixed numbers. You can write 120 as 120/1 or 119 and 4/4, but it wouldn't be in simplest form. The simplest form of any integer is the integer itself.
It depends what calculation you are doing.
which is 1.456 billon?
1,000,000,000
12,000,000,000
1276
10,000,000,000
120
10,000,000,000
17,000,000,000
one billon
there are 9 zeros in a millon
4,000,000,000
900,000,000,000,000 (UK) or 900,000,000,000 (USA)
2,700,000,000 or 2.7 × 109