That is the correct spelling of "half million" (500,000). The terminology for the determiner (adjective) would properly be "a half million" or "one-half million" or more colloquially "half a million."
e.g.
There were a half million refugees from the flood.
More than one-half million residents were without power.
As many as half a million cars were affected by the recall.
500,000
Half a million Five hundred thousand
It is three and a half million US dollars.
Six million five hundred-thousand - or - six and a half million.
To write 22,500,000 in words, you would say "twenty-two million five hundred thousand." This follows the standard naming convention for large numbers, where each group of three digits is named in terms of the power of ten it represents.
To write four and a half million in numbers, you would write 4,500,000. This is because the "and a half" part represents 500,000, which is half of a million. Therefore, when combined with the four million, it becomes 4,500,000.
two and a half million
Half a million is 500,000
As a number it is: 500,000 = half a million
can you saw me how can you write one and a half million in digits
Eighty million.
4,500,000