2009844 has 18 divisors (see below), whose sum is σ = 5080530. Its totient is φ = 669936.

The previous prime is 2009831. The next prime is 2009857. The reversal of 2009844 is 4489002.

It is an interprime number because it is at equal distance from previous prime (2009831) and next prime (2009857).

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 345744 = 1290^2 + 588^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27879 + ... + 27950.

2^2009844 is an apocalyptic number.

It is an amenable number.

2009844 is an abundant number, since it is smaller than the sum of its proper divisors (3070686).

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

2009844 is a wasteful number, since it uses less digits than its factorization.

2009844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55839 (or 55834 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2009844 is about 1417.6896698502. The cubic root of 2009844 is about 126.1984778168.

The spelling of 2009844 in words is "two million, nine thousand, eight hundred forty-four".