1215568 has 40 divisors (see below), whose sum is σ = 2577960. Its totient is φ = 552960.

The previous prime is 1215553. The next prime is 1215569. The reversal of 1215568 is 8655121.

It can be written as a sum of positive squares in 4 ways, for example, as 150544 + 1065024 = 388^2 + 1032^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215569) 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 7 ways as a sum of consecutive naturals, for example, 11098 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (64449).

2^1215568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288980).

1215568 is an abundant number, since it is smaller than the sum of its proper divisors (1362392).

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

1215568 is a wasteful number, since it uses less digits than its factorization.

1215568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 169 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 1215568 is about 1102.5280041795. The cubic root of 1215568 is about 106.7234246545.

The spelling of 1215568 in words is "one million, two hundred fifteen thousand, five hundred sixty-eight".