Depending on how it sound , the digits are interchangable. For a simple elaborate - the number four can be neutralised if you add another digit in front of it i.e. 54 - it actually sounds like won't die in the art of Fung Shui pratice.
The numerical pratice aslo depends on pratically who you are and what you do - 4 is a good number if you are a professional assassin.
The Good. Bad and Ulgy counting number depending on the variance. Some Chinese avoid 7 because it is an odd number and also 7 is associated with the month where the Ghosts are being released on that single day once a year. The combination number of 714 is considered a cursed number as it is also translated into sure to die!
Good numerical numbers generally are 1 - first in line , 8 - prosper 9 - longevity.
Single digit or max digits of 8, from 8 to 8888 has fetch record prices of car registration auspicious numbers in Hong Kong to Singapore , Malaysia to China where it is auctioned off by the govt.