2115656 has 16 divisors (see below), whose sum is σ = 3983100. Its totient is φ = 1053504.

The previous prime is 2115653. The next prime is 2115671. The reversal of 2115656 is 6565112.

It can be written as a sum of positive squares in 2 ways, for example, as 2044900 + 70756 = 1430^2 + 266^2 .

It is not an unprimeable number, because it can be changed into a prime (2115653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2630 + ... + 3338.

2^2115656 is an apocalyptic number.

It is an amenable number.

2115656 is a deficient number, since it is larger than the sum of its proper divisors (1867444).

2115656 is a wasteful number, since it uses less digits than its factorization.

2115656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1084 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 2115656 is about 1454.5294771850. The cubic root of 2115656 is about 128.3753630069.

It can be divided in two parts, 21156 and 56, that added together give a palindrome (21212).

The spelling of 2115656 in words is "two million, one hundred fifteen thousand, six hundred fifty-six".