2161885 has 16 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 1503040.

The previous prime is 2161883. The next prime is 2161897. The reversal of 2161885 is 5881612.

It is not a de Polignac number, because 2161885 - 2¹ = 2161883 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

2^2161885 is an apocalyptic number.

It is an amenable number.

2161885 is a deficient number, since it is larger than the sum of its proper divisors (792995).

2161885 is a wasteful number, since it uses less digits than its factorization.

2161885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748.

The product of its digits is 3840, while the sum is 31.

The square root of 2161885 is about 1470.3349958428. The cubic root of 2161885 is about 129.3036733335.

The spelling of 2161885 in words is "two million, one hundred sixty-one thousand, eight hundred eighty-five".