2161830 has 32 divisors (see below), whose sum is σ = 5660928. Its totient is φ = 524000.

The previous prime is 2161829. The next prime is 2161843. The reversal of 2161830 is 381612.

2161830 is digitally balanced in base 2, 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 = 2161797 and 2161806.

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 15 ways as a sum of consecutive naturals, for example, 2946 + ... + 3605.

It is an arithmetic number, because the mean of its divisors is an integer number (176904).

2^2161830 is an apocalyptic number.

2161830 is an abundant number, since it is smaller than the sum of its proper divisors (3499098).

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

2161830 is a wasteful number, since it uses less digits than its factorization.

2161830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6572.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2161830 is about 1470.3162925031. The cubic root of 2161830 is about 129.3025767962.

The spelling of 2161830 in words is "two million, one hundred sixty-one thousand, eight hundred thirty".