In Prakrut (Jain Ardhamāgadhī), “Arihant” is written and spoken as:

णमो अरिहंताणं ṇamo arihaṁtāṇaṁ – “I bow to the Arihants.”

So, the Prakrut word is “अरिहंत / अरिहंताणं” (arihanta / arihaṁtāṇaṁ).

• Sanskrit: अरिहन्त (Arihanta)
• Prakrut (Ardhamāgadhī): अरिहंत / अरिहंताणं (Arihanta / Arihaṁtāṇaṁ)

Both Digambar and Shwetambar traditions use essentially the same Prakrut form in the Navkār Mantra: “णमो अरिहंताणं” – this is the standard Prakrut form for Arihant there.

You can read more about Arihant here