361,000,862
8,413,019
800,012,005
9,801,664
3,238,000
3,238,000
1,148,000
There are seven digits.
1,839,065
8,653,017
5, 020,450,388
Three million eight hundred thousand is written as 3,800,000 in numerical form. In words, it's spelled out as "three million eight hundred thousand." When writing large numbers, it's helpful to group the digits in sets of three using commas for clarity.
Just write any digit or digits you want, then follow that by eight zeros.