e is a number equalling approximately 2.71828 and is the base for natural logarithms.
It is special because the derivative of ex is the same as itself.
e has many useful properties; the best known which is Euler's equation and which brings together e, i (the imaginary square root of -1) and the trigonometric functions:
eix = cos(x) + isin(x)
When x = π, this gives: eiπ = -1
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The mathematical constant, e, also referred to as Euler's number, is equal to 2.718 (and many more decimals). This value is the real number such that the value of the derivative of the function f(x)=ex at the point x=0 is equal to 1.2.72
The term misleading is the number that does not seem in pattern of the others.