# 3781

## 3,781 is an odd composite number composed of two prime numbers multiplied together.

What does the number 3781 look like?

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

3781 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 3781:

### 19 × 199

See below for interesting mathematical facts about the number 3781 from the Numbermatics database.

### Names of 3781

• Cardinal: 3781 can be written as Three thousand, seven hundred eighty-one.

### Scientific notation

• Scientific notation: 3.781 × 103

### Factors of 3781

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 218

### Divisors of 3781

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 4000
• Sum of proper divisors (its aliquot sum) s(n): 219
• 3781 is a deficient number, because the sum of its proper divisors (219) is less than itself. Its deficiency is 3562

### Bases of 3781

• Binary: 1110110001012
• Base-36: 2X1

### Squares and roots of 3781

• 3781 squared (37812) is 14295961
• 3781 cubed (37813) is 54053028541
• The square root of 3781 is 61.4898365587
• The cube root of 3781 is 15.5788558601

### Scales and comparisons

How big is 3781?
• 3,781 seconds is equal to 1 hour, 3 minutes, 1 second.
• To count from 1 to 3,781 would take you about three 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 3781 cubic inches would be around 1.3 feet tall.

### Recreational maths with 3781

• 3781 backwards is 1873
• 3781 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 3781's digits is 19
• More coming soon!