# 18891

## 18,891 is an odd composite number composed of two prime numbers multiplied together.

What does the number 18891 look like?

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

18891 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 18891:

### 32 × 2099

(3 × 3 × 2099)

See below for interesting mathematical facts about the number 18891 from the Numbermatics database.

### Names of 18891

• Cardinal: 18891 can be written as Eighteen thousand, eight hundred ninety-one.

### Scientific notation

• Scientific notation: 1.8891 × 104

### Factors of 18891

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 2102

### Divisors of 18891

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 27300
• Sum of proper divisors (its aliquot sum) s(n): 8409
• 18891 is a deficient number, because the sum of its proper divisors (8409) is less than itself. Its deficiency is 10482

### Bases of 18891

• Binary: 1001001110010112
• Base-36: EKR

### Squares and roots of 18891

• 18891 squared (188912) is 356869881
• 18891 cubed (188913) is 6741628921971
• The square root of 18891 is 137.4445342675
• The cube root of 18891 is 26.6328912667

### Scales and comparisons

How big is 18891?
• 18,891 seconds is equal to 5 hours, 14 minutes, 51 seconds.
• To count from 1 to 18,891 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 18891 cubic inches would be around 2.2 feet tall.

### Recreational maths with 18891

• 18891 backwards is 19881
• The number of decimal digits it has is: 5
• The sum of 18891's digits is 27
• More coming soon!