2181944 has 16 divisors (see below), whose sum is σ = 4131000. Its totient is φ = 1080352.

The previous prime is 2181937. The next prime is 2181947. The reversal of 2181944 is 4491812.

2181944 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419 + ... + 2130.

2^2181944 is an apocalyptic number.

It is an amenable number.

2181944 is a deficient number, since it is larger than the sum of its proper divisors (1949056).

2181944 is a wasteful number, since it uses less digits than its factorization.

2181944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662 (or 2658 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 2181944 is about 1477.1404807939. The cubic root of 2181944 is about 129.7023565213.

It can be divided in two parts, 2181 and 944, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2181944 in words is "two million, one hundred eighty-one thousand, nine hundred forty-four".