### ATANH(number)

Returns the hyperbolic arc-tangent of a number.

 number The number you want the inverse hyperbolic tangent of.

#### Remarks

 * The hyperbolic arc-tangent of a number is the inverse of the TANH function.* This function is also called the inverse hyperbolic tangent function.* If "number" > 1, then #NUM! is returned.* If "number" < 1, then #NUM! is returned.* If "number" = 1, then #NUM! is returned.* If "number" is not numeric, then #VALUE! is returned.* You can use the ACOSH function to return the hyperbolic arc-cosine.* You can use the ASINH function to return the hyperbolic arc-sine.* You can use the TANH function to return the hyperbolic tangent.* For a working example refer to the Quant > Hyperbolic Functions page.* For the Microsoft documentation refer to support.office.com

 A 1 =ATANH(0.5) = 0.549 2 =ATANH(-0.1) = -0.1 3 =ATANH(0.76159416) = 1 4 =ATANH(TANH(0.5)) = 0.5 5 =ATANH(1) = #NUM! 6 =ATANH(-1) = #NUM! 7 =ATANH(-10) = #NUM! 8 =ATANH("some text") = #VALUE!