2115856 has 10 divisors (see below), whose sum is σ = 4099502. Its totient is φ = 1057920.

The previous prime is 2115853. The next prime is 2115863. The reversal of 2115856 is 6585112.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 266256 = 1360^2 + 516^2 .

It is a super-2 number, since 2×2115856² = 8953693225472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2115853) 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 as a sum of consecutive naturals, namely, 66105 + ... + 66136.

2^2115856 is an apocalyptic number.

It is an amenable number.

2115856 is a deficient number, since it is larger than the sum of its proper divisors (1983646).

2115856 is a wasteful number, since it uses less digits than its factorization.

2115856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132249 (or 132243 counting only the distinct ones).

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

The square root of 2115856 is about 1454.5982263154. The cubic root of 2115856 is about 128.3794081295.

The spelling of 2115856 in words is "two million, one hundred fifteen thousand, eight hundred fifty-six".