# 1686

## 1,686 is an even composite number composed of three prime numbers multiplied together.

What does the number 1686 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

1686 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 1686:

### 2 × 3 × 281

See below for interesting mathematical facts about the number 1686 from the Numbermatics database.

### Names of 1686

• Cardinal: 1686 can be written as One thousand, six hundred eighty-six.

### Scientific notation

• Scientific notation: 1.686 × 103

### Factors of 1686

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 286

### Divisors of 1686

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 3384
• Sum of proper divisors (its aliquot sum) s(n): 1698
• 1686 is an abundant number, because the sum of its proper divisors (1698) is greater than itself. Its abundance is 12

### Bases of 1686

• Binary: 110100101102
• Base-36: 1AU

### Squares and roots of 1686

• 1686 squared (16862) is 2842596
• 1686 cubed (16863) is 4792616856
• The square root of 1686 is 41.0609303353
• The cube root of 1686 is 11.9019792861

### Scales and comparisons

How big is 1686?
• 1,686 seconds is equal to 28 minutes, 6 seconds.
• To count from 1 to 1,686 would take you about twenty-eight 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 1686 cubic inches would be around 1 feet tall.

### Recreational maths with 1686

• 1686 backwards is 6861
• The number of decimal digits it has is: 4
• The sum of 1686's digits is 21
• More coming soon!