# 3921

## 3,921 is an odd composite number composed of two prime numbers multiplied together.

What does the number 3921 look like?

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

3921 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 3921:

### 3 × 1307

See below for interesting mathematical facts about the number 3921 from the Numbermatics database.

### Names of 3921

• Cardinal: 3921 can be written as Three thousand, nine hundred twenty-one.

### Scientific notation

• Scientific notation: 3.921 × 103

### Factors of 3921

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1310

### Divisors of 3921

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 5232
• Sum of proper divisors (its aliquot sum) s(n): 1311
• 3921 is a deficient number, because the sum of its proper divisors (1311) is less than itself. Its deficiency is 2610

### Bases of 3921

• Binary: 1111010100012
• Base-36: 30X

### Squares and roots of 3921

• 3921 squared (39212) is 15374241
• 3921 cubed (39213) is 60282398961
• The square root of 3921 is 62.6178888179
• The cube root of 3921 is 15.7688109835

### Scales and comparisons

How big is 3921?
• 3,921 seconds is equal to 1 hour, 5 minutes, 21 seconds.
• To count from 1 to 3,921 would take you about five 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 3921 cubic inches would be around 1.3 feet tall.

### Recreational maths with 3921

• 3921 backwards is 1293
• The number of decimal digits it has is: 4
• The sum of 3921's digits is 15
• More coming soon!