2161844 has 6 divisors (see below), whose sum is σ = 3783234. Its totient is φ = 1080920.

The previous prime is 2161843. The next prime is 2161849. The reversal of 2161844 is 4481612.

2161844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1993744 + 168100 = 1412^2 + 410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270227 + ... + 270234.

It is an arithmetic number, because the mean of its divisors is an integer number (630539).

2^2161844 is an apocalyptic number.

It is an amenable number.

2161844 is a deficient number, since it is larger than the sum of its proper divisors (1621390).

2161844 is a wasteful number, since it uses less digits than its factorization.

2161844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540465 (or 540463 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 2161844 is about 1470.3210533758. The cubic root of 2161844 is about 129.3028559165.

The spelling of 2161844 in words is "two million, one hundred sixty-one thousand, eight hundred forty-four".