1215728 has 10 divisors (see below), whose sum is σ = 2355504. Its totient is φ = 607856.

The previous prime is 1215719. The next prime is 1215743. The reversal of 1215728 is 8275121.

It is a junction number, because it is equal to n+sod(n) for n = 1215697 and 1215706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37976 + ... + 38007.

2^1215728 is an apocalyptic number.

It is an amenable number.

1215728 is a deficient number, since it is larger than the sum of its proper divisors (1139776).

1215728 is an equidigital number, since it uses as much as digits as its factorization.

1215728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75991 (or 75985 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1215728 is about 1102.6005623071. The cubic root of 1215728 is about 106.7281069645.

The spelling of 1215728 in words is "one million, two hundred fifteen thousand, seven hundred twenty-eight".