2181626 has 8 divisors (see below), whose sum is σ = 3278880. Its totient is φ = 1088668.

The previous prime is 2181611. The next prime is 2181629. The reversal of 2181626 is 6261812.

2181626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2181595 and 2181604.

It is not an unprimeable number, because it can be changed into a prime (2181629) 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 in 3 ways as a sum of consecutive naturals, for example, 995 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (409860).

2^2181626 is an apocalyptic number.

2181626 is a deficient number, since it is larger than the sum of its proper divisors (1097254).

2181626 is a wasteful number, since it uses less digits than its factorization.

2181626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its digits is 1152, while the sum is 26.

The square root of 2181626 is about 1477.0328364664. The cubic root of 2181626 is about 129.6960552057.

The spelling of 2181626 in words is "two million, one hundred eighty-one thousand, six hundred twenty-six".