18921

18,921 is an odd composite number composed of four prime numbers multiplied together.

What does the number 18921 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

18921 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 18921:

3 × 7 × 17 × 53

See below for interesting mathematical facts about the number 18921 from the Numbermatics database.

Names of 18921

Cardinal: 18921 can be written as Eighteen thousand, nine hundred twenty-one.

Scientific notation

Scientific notation: 1.8921 × 10⁴

Factors of 18921

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 4
Sum of prime factors: 80

Divisors of 18921

Number of divisors d(n): 16
Complete list of divisors:
1 3 7 17 21 51 53 119 159 357 371 901 1113 2703 6307 18921
Sum of all divisors σ(n): 31104
Sum of proper divisors (its aliquot sum) s(n): 12183
18921 is a deficient number, because the sum of its proper divisors (12183) is less than itself. Its deficiency is 6738

Bases of 18921

Binary: 100100111101001₂
Hexadecimal: 0x49E9
Base-36: ELL

Squares and roots of 18921

18921 squared (18921²) is 358004241
18921 cubed (18921³) is 6773798243961
The square root of 18921 is 137.5536259065
The cube root of 18921 is 26.6469820007

Scales and comparisons

How big is 18921?

18,921 seconds is equal to 5 hours, 15 minutes, 21 seconds.
To count from 1 to 18,921 would take you about five 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 18921 cubic inches would be around 2.2 feet tall.

Recreational maths with 18921

18921 backwards is 12981
18921 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 18921's digits is 21
More coming soon!

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The information we have on file for 18921 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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