E (Euler's Constant) This property is used to return the value of Euler's Constant, which is 2.718281828459045. As with all math properties, it is stated with the Math object. syntax: Math.E EXAMPLE variableOne = Math.E; document.write("The value of Euler's Constant is " + variableOne); The above example will write the line "The value of Euler's Constant is 2.718281828459045" to the screen.