# 1815

## 1,815 is an odd composite number composed of three prime numbers multiplied together.

What does the number 1815 look like?

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

1815 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 1815:

### 3 × 5 × 112

(3 × 5 × 11 × 11)

See below for interesting mathematical facts about the number 1815 from the Numbermatics database.

### Names of 1815

• Cardinal: 1815 can be written as One thousand, eight hundred fifteen.

### Scientific notation

• Scientific notation: 1.815 × 103

### Factors of 1815

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 19

### Divisors of 1815

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 3192
• Sum of proper divisors (its aliquot sum) s(n): 1377
• 1815 is a deficient number, because the sum of its proper divisors (1377) is less than itself. Its deficiency is 438

### Bases of 1815

• Binary: 111000101112
• Base-36: 1EF

### Squares and roots of 1815

• 1815 squared (18152) is 3294225
• 1815 cubed (18153) is 5979018375
• The square root of 1815 is 42.6028168083
• The cube root of 1815 is 12.1981005733

### Scales and comparisons

How big is 1815?
• 1,815 seconds is equal to 30 minutes, 15 seconds.
• To count from 1 to 1,815 would take you about thirty 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 1815 cubic inches would be around 1 feet tall.

### Recreational maths with 1815

• 1815 backwards is 5181
• 1815 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 1815's digits is 15
• More coming soon!

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The information we have on file for 1815 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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