# 7900

## 7,900 is an even composite number composed of three prime numbers multiplied together.

What does the number 7900 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 18 divisors.

7900 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eighteen divisors.

## Prime factorization of 7900:

### 22 × 52 × 79

(2 × 2 × 5 × 5 × 79)

See below for interesting mathematical facts about the number 7900 from the Numbermatics database.

### Names of 7900

• Cardinal: 7900 can be written as Seven thousand, nine hundred.

### Scientific notation

• Scientific notation: 7.9 × 103

### Factors of 7900

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 86

### Divisors of 7900

• Number of divisors d(n): 18
• Complete list of divisors:
• Sum of all divisors σ(n): 17360
• Sum of proper divisors (its aliquot sum) s(n): 9460
• 7900 is an abundant number, because the sum of its proper divisors (9460) is greater than itself. Its abundance is 1560

### Bases of 7900

• Binary: 11110110111002
• Base-36: 63G

### Squares and roots of 7900

• 7900 squared (79002) is 62410000
• 7900 cubed (79003) is 493039000000
• The square root of 7900 is 88.8819441731
• The cube root of 7900 is 19.9163170129

### Scales and comparisons

How big is 7900?
• 7,900 seconds is equal to 2 hours, 11 minutes, 40 seconds.
• To count from 1 to 7,900 would take you about two 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 7900 cubic inches would be around 1.7 feet tall.

### Recreational maths with 7900

• 7900 backwards is 0097
• The number of decimal digits it has is: 4
• The sum of 7900's digits is 16
• More coming soon!