# 855

## 855 is an odd composite number composed of three prime numbers multiplied together.

What does the number 855 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

855 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

## Prime factorization of 855:

### 32 × 5 × 19

(3 × 3 × 5 × 19)

See below for interesting mathematical facts about the number 855 from the Numbermatics database.

### Names of 855

• Cardinal: 855 can be written as Eight hundred fifty-five.

### Scientific notation

• Scientific notation: 8.55 × 102

### Factors of 855

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 27

### Divisors of 855

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 1560
• Sum of proper divisors (its aliquot sum) s(n): 705
• 855 is a deficient number, because the sum of its proper divisors (705) is less than itself. Its deficiency is 150

### Bases of 855

• Binary: 11010101112
• Base-36: NR

### Squares and roots of 855

• 855 squared (8552) is 731025
• 855 cubed (8553) is 625026375
• The square root of 855 is 29.2403830343
• The cube root of 855 is 9.4912199581

### Scales and comparisons

How big is 855?
• 855 seconds is equal to 14 minutes, 15 seconds.
• To count from 1 to 855 would take you about seven minutes.

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 855 cubic inches would be around 0.8 feet tall.

### Recreational maths with 855

• 855 backwards is 558
• The number of decimal digits it has is: 3
• The sum of 855's digits is 18
• More coming soon!