18421

18,421 is an odd composite number composed of two prime numbers multiplied together.

What does the number 18421 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

18421 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 18421:

13² × 109

(13 × 13 × 109)

See below for interesting mathematical facts about the number 18421 from the Numbermatics database.

Names of 18421

Cardinal: 18421 can be written as Eighteen thousand, four hundred twenty-one.

Scientific notation

Scientific notation: 1.8421 × 10⁴

Factors of 18421

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 3
Sum of prime factors: 122

Divisors of 18421

Number of divisors d(n): 6
Complete list of divisors:
1 13 109 169 1417 18421
Sum of all divisors σ(n): 20130
Sum of proper divisors (its aliquot sum) s(n): 1709
18421 is a deficient number, because the sum of its proper divisors (1709) is less than itself. Its deficiency is 16712

Bases of 18421

Binary: 100011111110101₂
Hexadecimal: 0x47F5
Base-36: E7P

Squares and roots of 18421

18421 squared (18421²) is 339333241
18421 cubed (18421³) is 6250857632461
The square root of 18421 is 135.7239846157
The cube root of 18421 is 26.4101621423

Scales and comparisons

How big is 18421?

18,421 seconds is equal to 5 hours, 7 minutes, 1 second.
To count from 1 to 18,421 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 18421 cubic inches would be around 2.2 feet tall.

Recreational maths with 18421

18421 backwards is 12481
The number of decimal digits it has is: 5
The sum of 18421's digits is 16
More coming soon!

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The information we have on file for 18421 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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