If these fugures are correct then this sounds excellent. Still you have to have in mind that this is just the number of open accounts, not actual users, so these two numbers might vary. Also, not of all these open accounts will be actualy used.
Another thing is that both Blockchain and Coinbase are making the promotion of their business and services so take this statistics with some reserve.
I would think an account is equal to one user since they most likely don't allow to have multiple accounts and require identification...