To find the sum of the numbers from 1 to 39, we can use the formula for the sum of an arithmetic series:

Sn = (n/2)(a + l)

Where Sn is the sum of the series, n is the number of terms, a is the first term, and l is the last term.

In this case, a = 1, l = 39, and n = 39.

Sn = (39/2)(1 + 39)
Sn = (39/2)(40)
Sn = 19.5 * 40
Sn = 780

Therefore, the sum of the numbers from 1 to 39 is 780.