Question

How to check if a number is curious number (sum of the factorials of each digit equal to itself) in PHP

Answer 1

function factorial($n) {
    return ($n == 1 || $n == 0) ? 1 : $n * factorial($n - 1);
}

function sumFactorialDigits($num) {
    $sum = 0;
     
    while ($num != 0) {
        $sum += factorial($num % 10);
        $num = (int)($num / 10);
    }
     
    return $sum;
}


$number = 145;

if ($number == sumFactorialDigits($number)) {
    echo "Curious number";
} else {
        echo "Not curious number";
}




/*
run:

Curious number

*/

 

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