For the HP printer support number, you don’t need to put additional efforts because it gets downloaded automatically, when you download the full-featured drivers of your printer.
For the download, you have to visit the Support and Downloads section on the website, and then provide your specific HP printer details. After you enter the same, you will be asked to verify your operating system details. If everything is correct, then hit the download button to start the driver download process. Now, run the downloaded file by double-clicking it to proceed to the installation.