2109808 has 20 divisors (see below), whose sum is σ = 4229640. Its totient is φ = 1018304.

The previous prime is 2109799. The next prime is 2109841. The reversal of 2109808 is 8089012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1810 + ... + 2737.

It is an arithmetic number, because the mean of its divisors is an integer number (211482).

2^2109808 is an apocalyptic number.

It is an amenable number.

2109808 is an abundant number, since it is smaller than the sum of its proper divisors (2119832).

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

2109808 is a wasteful number, since it uses less digits than its factorization.

2109808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 2109808 is about 1452.5178140044. The cubic root of 2109808 is about 128.2569707436.

The spelling of 2109808 in words is "two million, one hundred nine thousand, eight hundred eight".