/* Convert value as 8-bit unsigned integer to 2 digit hexadecimal number. */

function hex8(val) {
    val &= 0xFF;
    var hex = val.toString(16).toUpperCase();
    return ("00" + hex).slice(-2);
}

/* Convert value as 16-bit unsigned integer to 4 digit hexadecimal number. */

function hex16(val) {
    val &= 0xFFFF;
    var hex = val.toString(16).toUpperCase();
    return ("0000" + hex).slice(-4);
}

/* Convert value as 32-bit unsigned integer to 8 digit hexadecimal number. */

function hex32(val) {
    val &= 0xFFFFFFFF;
    var hex = val.toString(16).toUpperCase();
    return ("00000000" + hex).slice(-8);
}


var num = 1065489844;
console.log("0x" + hex32(num)); // will output 0x3F8215B4