1239.6541 is a decimal number in the decimal system.It is composed of four positive integers (1,2,3,9) and four decimal digits(6,5,4,1). In decimal system, the integer 1239 stands for a thousand, a hundred ,two tens and three units and the decimal .6541 stands for six tenths, five hundredths, four thousandths and one ten thousandth. This number can be used as a measurement of a physical quantity or an amount of money.