Getting NaN when a directive is used in angularJs - html

Question

I am using a directive to show the number count effect for my dashboard when i used the directive for the h3 i am getting the result as NaN. when i remove the directive from the h3 i am getting the correct output.
When i looked into the directive i can the the value is get from element which shows the value as NaN. can anyone tell me what is wrong in the code?
Output with directive:
<h3 animate-numbers="" class="ng-binding">NaN</h3>
Html:
<h3 animate-numbers>{{vm.dashboard.no_of_applications}}</h3>
Controller:
vm.dashboard = {
no_of_users: 0,
no_of_applications: 0,
no_of_departments: 0,
no_of_schemes: 0,
};
Directive:
'use strict';
angular.module('ss')
.directive('animateNumbers', function ($timeout, $log) {
return {
replace: false,
scope: true,
link: function (scope, element) {
var e = element[0];
$log.log('e is', e);
var refreshInterval = 30;
var duration = 1000; //milliseconds
var number = parseInt(e.innerText);
var step = 0;
var num = 0;
var steps = Math.ceil(duration / refreshInterval);
var increment = (number / steps);
var percentCompleted = 0;
var lastNumberSlowCount = 3;
if (number > lastNumberSlowCount) {
number = number - lastNumberSlowCount;
}
scope.timoutId = null;
var slowCounter = function () {
scope.timoutId = $timeout(function () {
lastNumberSlowCount --;
if (lastNumberSlowCount < 0) {
$timeout.cancel(scope.timoutId);
} else {
number++;
e.textContent = number;
slowCounter();
}
}, 500);
};
var counter = function () {
scope.timoutId = $timeout(function () {
num += increment;
percentCompleted = Math.round((num / number) * 100);
if (percentCompleted > 60 && percentCompleted < 80) {
refreshInterval = refreshInterval + 10;
} else if (percentCompleted > 90) {
refreshInterval = 200;
}
step++;
if (step >= steps) {
$timeout.cancel(scope.timoutId);
num = number;
e.textContent = number;
if (number > lastNumberSlowCount) {
slowCounter();
}
} else {
e.textContent = Math.round(num);
counter();
}
}, refreshInterval);
};
counter();
return true;
}
};
});