Are 786 the numerical values of Bismillah or Hare Krishna?
Instead of Bismillah, it is better that words like "Bismillah-ir-Rahman-ir-Rahim" or "Bi-Ismihi Subhanahu Ta'ala" are written; however, if with the purpose of saving it from disrespect, the numerical value of Bismillah, 786, is written, then that is also not prohibited. And the numerical value of Hare Krishna is 785, not 786. Only Allah the Exalted knows best. (Kitab-un-Nawazil/Vol: 15/Pg: 94)