# 47. Math Facts And Other Fun Facts About The Number 47.

Updated on January 5, 2013

Math facts of the number 47

The number 47 is the 24th odd number.

The number 47 only has 2 divisors - so the number 47 is a prime number. It is also the fifteenth prime number (2, 3, 5, 7, 11, 13, 17, 19,23,29,31,37,41,43 and 47)

The square root of 47 is 6.86 rounded to 3 significant figures.

If you square the number 47 you get 2209. Also if you work out the cube of 47 you get 103823.

The number 47 is also the third Carol number (-1,7,47…)

47% as a fraction is 47/100 or 0.47 as a decimal.

In the binary number system 47 can be written as 101111.

In the hexadecimal number system 47 can be written as 2F.

In Roman Numerals the number 47 is denoted by the letter XLVII.

Other conversions involving the number 47:

47 inches is about the same length as 119 centimeters.

A speed of 47 miles per hour is the same as 76 kilometers per hour.

In 47 minutes there are 2820 seconds.

47 pounds is about the same weight as 21 kilograms

Other interesting facts about the number 47:

In Chemistry, 47 is the atomic number of Silver. Also the atomic mass of Titanium is 47,

In music, Takako Minewaka released the song “Kangaroo Pocket Calculator” which was all about the number 47. Also in July 2008, English rock band Wire released the album entitled “Object 47”. Also the fourth song on the album Not Without A Fight by New Found Glory (who are an American rock band) was called “47”.

The name of a 47 sided regular polygon is tetracontakaiheptagon.

In the film National Treasure Book of Secrets, the sequel to the 2004 film National Treasure, page 47 of the president’s book of secrets contains all the secrets of previous US presidents.

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