2181836 has 12 divisors (see below), whose sum is σ = 3838800. Its totient is φ = 1085040.

The previous prime is 2181833. The next prime is 2181857. The reversal of 2181836 is 6381812.

2181836 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2181799 and 2181808.

It is not an unprimeable number, because it can be changed into a prime (2181833) 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, 575 + ... + 2166.

It is an arithmetic number, because the mean of its divisors is an integer number (319900).

2^2181836 is an apocalyptic number.

It is an amenable number.

2181836 is a deficient number, since it is larger than the sum of its proper divisors (1656964).

2181836 is a wasteful number, since it uses less digits than its factorization.

2181836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944 (or 2942 counting only the distinct ones).

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

The square root of 2181836 is about 1477.1039232227. The cubic root of 2181836 is about 129.7002165205.

The spelling of 2181836 in words is "two million, one hundred eighty-one thousand, eight hundred thirty-six".