Excel 2013 Shapes Color mystery

What I'm trying to do is

ActiveSheet.Shapes("shpPart1").Fill.ForeColor = 13998939

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but I get a Type Mismatch error.

Can someone please explain why I'm getting this? I see that the ForeColor is a long integer but I get a Type Mismatch error. So I tried String data type and get the same error.

Sub PartShapesTEST2()

    Dim s As Shape
    Dim lngColor As Long
    
    Set s = ActiveSheet.Shapes("shpPart1")
    
    lngColor = s.Fill.ForeColor
    
    s.Fill.ForeColor = lngColor
    
End Sub

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