PHP Query

Hello dear Sirs!
I need help
I have a function that does the following:

1) Get a number from a rm submitted – ok
2) Query this number to find a second number – ok
3) Add a row on a table and pass the second number. i can add a row, but this number2 come as zero in the new row. The other fields are ok.

$number1= $_POST['item_meta'][434];
   $numero_ntr = $wpdb->get_results(
	"
	SELECT meta_value,item_id
	FROM wp_residuos3frm_item_metas
	WHERE meta_value = $number1
        AND field_id = '263'
	"
);
// NUMBER2 FROM TABLE:
              $number2= $numero_ntr->item_id;

// INSERT A NEW ROW ON A TABLE

              $table ='wp_residuos3frm_item_metas';
              $sim = "Sim";
              $wpdb->insert(
              $table,
              array(
                'meta_value' => $sim, //OK
                'field_id' => 340, // OK
                'item_id' => $number2 // PROBLEM HERE!
              ),
              array(
	        '%s',
	        '%d',
                '%s'
              )
              );

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