18978990

18,978,990 is an even composite number composed of five prime numbers multiplied together.

What does the number 18978990 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 32 divisors.

18978990 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of thirty-two divisors.

Prime factorization of 18978990:

2 × 3 × 5 × 239 × 2647

See below for interesting mathematical facts about the number 18978990 from the Numbermatics database.

Names of 18978990

Cardinal: 18978990 can be written as Eighteen million, nine hundred seventy-eight thousand, nine hundred ninety.

Scientific notation

Scientific notation: 1.897899 × 10⁷

Factors of 18978990

Number of distinct prime factors ω(n): 5
Total number of prime factors Ω(n): 5
Sum of prime factors: 2896

Divisors of 18978990

Number of divisors d(n): 32
Complete list of divisors:
1 2 3 5 6 10 15 30 239 478 717 1195 1434 2390 2647 3585 5294 7170 7941 13235 15882 26470 39705 79410 632633 1265266 1897899 3163165 3795798 6326330 9489495 18978990
Sum of all divisors σ(n): 45757440
Sum of proper divisors (its aliquot sum) s(n): 26778450
18978990 is an abundant number, because the sum of its proper divisors (26778450) is greater than itself. Its abundance is 7799460

Bases of 18978990

Binary: 1001000011001100010101110₂
Hexadecimal: 0x12198AE
Base-36: BASA6

Squares and roots of 18978990

18978990 squared (18978990²) is 360202061420100
18978990 cubed (18978990³) is 6836271321671463699000
The square root of 18978990 is 4356.4882646461
The cube root of 18978990 is 266.7417722477

Scales and comparisons

How big is 18978990?

18,978,990 seconds is equal to 31 weeks, 2 days, 15 hours, 56 minutes, 30 seconds.
To count from 1 to 18,978,990 would take you about forty-seven weeks!

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 18978990 cubic inches would be around 22.2 feet tall.

Recreational maths with 18978990

18978990 backwards is 09987981
The number of decimal digits it has is: 8
The sum of 18978990's digits is 51
More coming soon!

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The information we have on file for 18978990 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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