7921

7,921 is an odd composite number. It is composed of a single prime number multiplied by itself.

What does the number 7921 look like?

This visualization shows the relationship between its 1 prime factors (large circles) and 3 divisors.

7921 is an odd composite number. It has a total of three divisors.

Prime factorization of 7921:

89²

(89 × 89)

See below for interesting mathematical facts about the number 7921 from the Numbermatics database.

Names of 7921

Cardinal: 7921 can be written as Seven thousand, nine hundred twenty-one.

Scientific notation

Scientific notation: 7.921 × 10³

Factors of 7921

Number of distinct prime factors ω(n): 1
Total number of prime factors Ω(n): 2
Sum of prime factors: 89

Divisors of 7921

Number of divisors d(n): 3
Complete list of divisors:
1 89 7921
Sum of all divisors σ(n): 8011
Sum of proper divisors (its aliquot sum) s(n): 90
7921 is a deficient number, because the sum of its proper divisors (90) is less than itself. Its deficiency is 7831

Bases of 7921

Binary: 1111011110001₂
Hexadecimal: 0x1EF1
Base-36: 641

Squares and roots of 7921

7921 squared (7921²) is 62742241
7921 cubed (7921³) is 496981290961
7921 is a perfect square number. Its square root is 89
The cube root of 7921 is 19.9339487685

Scales and comparisons

How big is 7921?

7,921 seconds is equal to 2 hours, 12 minutes, 1 second.
To count from 1 to 7,921 would take you about two hours.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
A cube with a volume of 7921 cubic inches would be around 1.7 feet tall.

Recreational maths with 7921

7921 backwards is 1297
The number of decimal digits it has is: 4
The sum of 7921's digits is 19
More coming soon!

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The information we have on file for 7921 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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