2109856 has 24 divisors (see below), whose sum is σ = 4747680. Its totient is φ = 904128.

The previous prime is 2109841. The next prime is 2109857. The reversal of 2109856 is 6589012.

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

It is not an unprimeable number, because it can be changed into a prime (2109857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4486 + ... + 4933.

It is an arithmetic number, because the mean of its divisors is an integer number (197820).

2^2109856 is an apocalyptic number.

It is an amenable number.

2109856 is an abundant number, since it is smaller than the sum of its proper divisors (2637824).

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

2109856 is an equidigital number, since it uses as much as digits as its factorization.

2109856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436 (or 9428 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2109856 is about 1452.5343369435. The cubic root of 2109856 is about 128.2579433894.

The spelling of 2109856 in words is "two million, one hundred nine thousand, eight hundred fifty-six".