No problem, we've got 3965 and 2166 to multiply
3965 × 2166 = 2166 × (3965)
+ 2166 × 5 that equals 10830
+ 2166 × 60 what gives us 129960
+ 2166 × 900 that results in 1949400
+ 2166 × 3000 which equals 6498000

= 8588190
