Generally, the number 8 is the best for things of a financial nature. Without knowing the purpose of the bank account (business, personal, partnership, funding, …), I will suggest the number 8 for the bank account number.

Note that a bank account number has an external numerology influence. Much more important is intrinsic numerology energy.

Numerology calculations can be applied to anything with a name and anything with a number. But external influences are less important than intrinsic influences, as you'll see when you read the above-linked web pages.