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Numbers 3900-3999

A page of the Numeropedia - the Special Encyclopedia of Numbers

3000-3099    3100-3199   3200-3299   3300-3399   3400-3499

3500-3599    3600-3699   3700-3799   3800-3899   3900-3999

All Numbers & [1K…) * [2K…) * [3K…) * [4K…) * [5K…) * [6K…) * [7K…) * [8K…) *  [9K…)  & [10K] & [100K]

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 3,900

[EECS]  3.9K(W) is one of standard numerical values for resistors (of tolerance class 5%).

 

3,907

[Math.]  A prime number.  

 

[Math.] 39073 = 59,638,983,643 = (5–9+6+3898–36+43)3.

 

[Math.]  The equality 3907×4 = 15,628 uses each of 10 digits 0-9 once.

 

3,912

[Math.]  Two multiples of number 3912, 3912×5 = 19,560 and 3912×7 = 27,384, use each of 10 digits 0-9 once.

 

3,916

[Math.]  A triangular number (sum of all integers from 1 to 88): 3916 = 1+2+…+87+88.

 

3,924

[Math.]  Two multiples of number 1962, 1962×2 = 3924 and 1962×9 = 17,658, use each of 9 digits 1-9 once.

 

3,942

[Math.]  27,594 = 7×3942 = 73×9×42.

 

[Math.]  Each ratio 15768/3942 = 17568/4392 = 23184/5796 = 31824/7956 = 4, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #4.

 

3,950, 3,959 & 3,963

[Geology]  The mean radius (miles) of the Earth is 3959 miles (6371 km).

The equatorial radius of the Earth is 3963 miles (6378 km).

The polar radius of the Earth is 3950 miles (6357 km).

 

3,960

[Math.]  Sum (in degrees) of all internal angles of a 24-side polygon.

 

3,969

[Math.]  3969 = (3–9+69)2 = 632. (Sequence of numbers 60…03).

 

3,972

[Math.]  11,093,796 = 3972×2793 = 6951×1596.

 

3,985

[Math.]  3985 = 3333+9+88+555.