# 865

## 865 is an odd composite number composed of two prime numbers multiplied together.

What does the number 865 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

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

## Prime factorization of 865:

### 5 × 173

See below for interesting mathematical facts about the number 865 from the Numbermatics database.

### Names of 865

• Cardinal: 865 can be written as Eight hundred sixty-five.

### Scientific notation

• Scientific notation: 8.65 × 102

### Factors of 865

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 178

### Divisors of 865

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1044
• Sum of proper divisors (its aliquot sum) s(n): 179
• 865 is a deficient number, because the sum of its proper divisors (179) is less than itself. Its deficiency is 686

### Bases of 865

• Binary: 11011000012
• Base-36: O1

### Squares and roots of 865

• 865 squared (8652) is 748225
• 865 cubed (8653) is 647214625
• The square root of 865 is 29.4108823397
• The cube root of 865 is 9.5280794345

### Scales and comparisons

How big is 865?
• 865 seconds is equal to 14 minutes, 25 seconds.
• To count from 1 to 865 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 865 cubic inches would be around 0.8 feet tall.

### Recreational maths with 865

• 865 backwards is 568
• The number of decimal digits it has is: 3
• The sum of 865's digits is 19
• More coming soon!