1215396 has 108 divisors (see below), whose sum is σ = 3921372. Its totient is φ = 314496.

The previous prime is 1215391. The next prime is 1215397. The reversal of 1215396 is 6935121.

1215396 is a `hidden beast` number, since 121 + 539 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 509796 + 705600 = 714^2 + 840^2 .

Its product of digits (1620) is a multiple of the sum of its prime factors (90).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215391) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22906 + ... + 22958.

It is an arithmetic number, because the mean of its divisors is an integer number (36309).

2^1215396 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 1215396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1960686).

1215396 is an abundant number, since it is smaller than the sum of its proper divisors (2705976).

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

1215396 is a wasteful number, since it uses less digits than its factorization.

1215396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 78 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1215396 is about 1102.4499988662. The cubic root of 1215396 is about 106.7183907129.

The spelling of 1215396 in words is "one million, two hundred fifteen thousand, three hundred ninety-six".