Learn how to write and say 40000 in words as Forty Thousand . See the place value chart, examples, problems and FAQs on 40000 in words. Then you may see that the 40 thousand in numbers takes more space but if we write that down in scientific notation then it will look like this : 4 × 104 How many zeros does 40 thousand have? When we count zeros in 40 thousand above, we see that there are 4 zeros. If you want to write 40 thousand in words, then it will be written as ` forty ... Fourty or forty thousand - 59135742Answer: Step-by-step explanation: 40000 in words is Forty Thousand . The number name of 40000 can be written using the ones, tens, hundreds, thousands place of a number. 40000 is written as Forty Thousand in words in the Indian number system. This is the correct and standard spelling used in academic, banking, and official documents.