1215528 has 16 divisors (see below), whose sum is σ = 3038880. Its totient is φ = 405168.

The previous prime is 1215521. The next prime is 1215553. The reversal of 1215528 is 8255121.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 50647 = 1215528 / (1 + 2 + 1 + 5 + 5 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1215498 and 1215507.

It is not an unprimeable number, because it can be changed into a prime (1215521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25300 + ... + 25347.

It is an arithmetic number, because the mean of its divisors is an integer number (189930).

2^1215528 is an apocalyptic number.

It is an amenable number.

1215528 is an abundant number, since it is smaller than the sum of its proper divisors (1823352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215528 is a wasteful number, since it uses less digits than its factorization.

1215528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50656 (or 50652 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1215528 is about 1102.5098639015. The cubic root of 1215528 is about 106.7222540128.

The spelling of 1215528 in words is "one million, two hundred fifteen thousand, five hundred twenty-eight".