[CSS]ime-modeを英数字入力モードに指定

CSS

input[type="number"]	{
	ime-mode: disabled;
	-webkit-ime-mode: disabled;
	-moz-ime-mode: disabled;
	-ms-ime-mode: disabled;
}

HTML

<form>
  <div class="form-group">
    <input type="number" class="form-control">
  </div>
</form>

デモ