Everything about 7

Discover a lot of information on the number 7: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!


Mathematical operations

Operations and solutions
7*2 = 14 The double of 7 is 14
7*3 = 21 The triple of 7 is 21
7/2 = 3.5 The half of 7 is 3.500000
7/3 = 2.3333333333333 The third of 7 is 2.300000
72 = 49 The square of 7 is 49.000000
73 = 343 The cube of 7 is 343.000000
√7 = 2.6457513110646 The square root of 7 is 2.645751
log(7) = 1.9459101490553 The natural (Neperian) logarithm of 7 is 1.945910
log10(7) = 0.84509804001426 The decimal logarithm (base 10) of 7 is 0.845098
sin(7) = 0.65698659871879 The sine of 7 is 0.656987
cos(7) = 0.7539022543433 The cosine of 7 is 0.753902
tan(7) = 0.87144798272432 The tangent of 7 is 0.871448


Mathematical representations and links

Other ways to write 7
In letter Seven
In roman numeral VII
In binary 111
In octal 7
In hexadecimal 7
In US dollars USD 7.00 ($)
In euros 7,00 EUR (€)
Some related numbers
Previous number 6
Next number 8
Next prime number 11

How to write / spell 7 in letters?

In letters, the number 7 is written as: Seven. And in other languages? how does it spell?

7 in other languages
Write 7 in english Seven
Write 7 in french Sept
Write 7 in spanish Siete
Write 7 in portuguese Sete

Mathematical properties of 7

Questions and answers
Is 7 a prime number? Yes
Is 7 a perfect number? No
Number of divisors 2
List of dividers 1, 7
Sum of divisors 8

Some random numbers

7
13
13
71
1
92
56
68
41
24
39
75
95
4
95
41
20
17
190