barplot scale Y axis

I try to create a barplot for this dataframe :

    WeekInMonth NBR_IMPR
0        1      390871847
1        2      742535347
2        3      726636751
3        4      803836568
4        5      369273437

I use this basic code :

# Barplot
sns.barplot(x ="WeekInMonth" , y ="NBR_IMPR" , data=sub_imp)

But the issue is i got numbers for Y axis from 0 to 1.2 Is it any way to change this scale to represet really the true numbers of NBR_IMPR column?

Thanks