2181822 has 16 divisors (see below), whose sum is σ = 4419840. Its totient is φ = 717912.

The previous prime is 2181737. The next prime is 2181833. The reversal of 2181822 is 2281812.

2181822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2181792 and 2181801.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1828 + ... + 2775.

It is an arithmetic number, because the mean of its divisors is an integer number (276240).

2^2181822 is an apocalyptic number.

2181822 is an abundant number, since it is smaller than the sum of its proper divisors (2238018).

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

2181822 is a wasteful number, since it uses less digits than its factorization.

2181822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687.

The product of its digits is 512, while the sum is 24.

The square root of 2181822 is about 1477.0991842121. The cubic root of 2181822 is about 129.6999391078.

It can be divided in two parts, 2181 and 822, that added together give a palindrome (3003).

The spelling of 2181822 in words is "two million, one hundred eighty-one thousand, eight hundred twenty-two".