2209644 has 18 divisors (see below), whose sum is σ = 5585580. Its totient is φ = 736536.

The previous prime is 2209639. The next prime is 2209661. The reversal of 2209644 is 4469022.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30654 + ... + 30725.

It is an arithmetic number, because the mean of its divisors is an integer number (310310).

2^2209644 is an apocalyptic number.

It is an amenable number.

2209644 is an abundant number, since it is smaller than the sum of its proper divisors (3375936).

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

2209644 is a wasteful number, since it uses less digits than its factorization.

2209644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61389 (or 61384 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 2209644 is about 1486.4871341522. The cubic root of 2209644 is about 130.2489116635.

The spelling of 2209644 in words is "two million, two hundred nine thousand, six hundred forty-four".