balancedNum.js

const balancedNum = number => {
  const str = number.toString();

  const getMiddle = s => {
    const splited = s.split('');
    if (splited.length % 2 === 0) {
      return splited[splited.length / 2 - 1] + splited[splited.length / 2];
    } else {
      return splited[Math.floor(splited.length / 2)];
    }
  }
  
  const sum = s => {
    if(s.length) {
      return s.split('').reduce((acc, curr) => parseInt(acc) + parseInt(curr));
    } else {
      return 0;
    }
  }
  
  const [ left, right ] = str.split(getMiddle(str));
  
  return sum(left) === sum(right)
          ? 'Balanced'
          : 'Not Balanced';
  
}

console.log(balancedNum(56239814)) // Balanced