2209856 has 56 divisors (see below), whose sum is σ = 4962144. Its totient is φ = 967680.

The previous prime is 2209853. The next prime is 2209891. The reversal of 2209856 is 6589022.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (2209853) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30236 + ... + 30308.

2^2209856 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 2209856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2481072).

2209856 is an abundant number, since it is smaller than the sum of its proper divisors (2752288).

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

2209856 is a wasteful number, since it uses less digits than its factorization.

2209856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2209856 is about 1486.5584415017. The cubic root of 2209856 is about 130.2530770233.

The spelling of 2209856 in words is "two million, two hundred nine thousand, eight hundred fifty-six".