# 15987

## 15,987 is an odd composite number composed of two prime numbers multiplied together.

What does the number 15987 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

15987 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

## Prime factorization of 15987:

### 3 × 732

(3 × 73 × 73)

See below for interesting mathematical facts about the number 15987 from the Numbermatics database.

### Names of 15987

• Cardinal: 15987 can be written as Fifteen thousand, nine hundred eighty-seven.

### Scientific notation

• Scientific notation: 1.5987 × 104

### Factors of 15987

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 76

### Divisors of 15987

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 21612
• Sum of proper divisors (its aliquot sum) s(n): 5625
• 15987 is a deficient number, because the sum of its proper divisors (5625) is less than itself. Its deficiency is 10362

### Bases of 15987

• Binary: 111110011100112
• Base-36: CC3

### Squares and roots of 15987

• 15987 squared (159872) is 255584169
• 15987 cubed (159873) is 4086024109803
• The square root of 15987 is 126.4397089525
• The cube root of 15987 is 25.1915945763

### Scales and comparisons

How big is 15987?
• 15,987 seconds is equal to 4 hours, 26 minutes, 27 seconds.
• To count from 1 to 15,987 would take you about four 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 15987 cubic inches would be around 2.1 feet tall.

### Recreational maths with 15987

• 15987 backwards is 78951
• The number of decimal digits it has is: 5
• The sum of 15987's digits is 30
• More coming soon!