# 1287

## 1,287 is an odd composite number composed of three prime numbers multiplied together.

What does the number 1287 look like?

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

1287 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 1287:

### 32 × 11 × 13

(3 × 3 × 11 × 13)

See below for interesting mathematical facts about the number 1287 from the Numbermatics database.

### Names of 1287

• Cardinal: 1287 can be written as One thousand, two hundred eighty-seven.

### Scientific notation

• Scientific notation: 1.287 × 103

### Factors of 1287

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

### Divisors of 1287

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 2184
• Sum of proper divisors (its aliquot sum) s(n): 897
• 1287 is a deficient number, because the sum of its proper divisors (897) is less than itself. Its deficiency is 390

### Bases of 1287

• Binary: 101000001112
• Base-36: ZR

### Squares and roots of 1287

• 1287 squared (12872) is 1656369
• 1287 cubed (12873) is 2131746903
• The square root of 1287 is 35.8747822293
• The cube root of 1287 is 10.8774271237

### Scales and comparisons

How big is 1287?
• 1,287 seconds is equal to 21 minutes, 27 seconds.
• To count from 1 to 1,287 would take you about twenty-one 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 1287 cubic inches would be around 0.9 feet tall.

### Recreational maths with 1287

• 1287 backwards is 7821
• The number of decimal digits it has is: 4
• The sum of 1287's digits is 18
• More coming soon!