# 399

## 399 is an odd composite number composed of three prime numbers multiplied together.

What does the number 399 look like?

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

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

## Prime factorization of 399:

### 3 × 7 × 19

See below for interesting mathematical facts about the number 399 from the Numbermatics database.

### Names of 399

• Cardinal: 399 can be written as Three hundred ninety-nine.

### Scientific notation

• Scientific notation: 3.99 × 102

### Factors of 399

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 29

### Divisors of 399

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 640
• Sum of proper divisors (its aliquot sum) s(n): 241
• 399 is a deficient number, because the sum of its proper divisors (241) is less than itself. Its deficiency is 158

### Bases of 399

• Binary: 1100011112
• Base-36: B3

### Squares and roots of 399

• 399 squared (3992) is 159201
• 399 cubed (3993) is 63521199
• The square root of 399 is 19.9749843553
• The cube root of 399 is 7.3619178209

### Scales and comparisons

How big is 399?
• 399 seconds is equal to 6 minutes, 39 seconds.
• To count from 1 to 399 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 399 cubic inches would be around 0.6 feet tall.

### Recreational maths with 399

• 399 backwards is 993
• 399 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 399's digits is 21
• More coming soon!

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Chicago style:
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The information we have on file for 399 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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