This number is a prime.
978403 = 9^n+8^n+7^n+6^n+5^n+4^n+3^n+2^n-1^n, (case n=6). The smallest emirp of this form. [Bajpai]
978403 = 9^n+8^n+7^n+6^n+5^n+4^n+3^n+2^n-1^n, (case n=6). The smallest emirp of this form. [Bajpai]