2105856 has 60 divisors (see below), whose sum is σ = 6090942. Its totient is φ = 700416.

The previous prime is 2105843. The next prime is 2105863. The reversal of 2105856 is 6585012.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 665856 = 1200^2 + 816^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4380 + ... + 4836.

2^2105856 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 2105856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3045471).

2105856 is an abundant number, since it is smaller than the sum of its proper divisors (3985086).

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

2105856 is an equidigital number, since it uses as much as digits as its factorization.

2105856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2105856 is about 1451.1567799518. The cubic root of 2105856 is about 128.1768389083.

The spelling of 2105856 in words is "two million, one hundred five thousand, eight hundred fifty-six".