2165842 has 16 divisors (see below), whose sum is σ = 3769920. Its totient is φ = 913968.

The previous prime is 2165819. The next prime is 2165843. The reversal of 2165842 is 2485612.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165842.

It is not an unprimeable number, because it can be changed into a prime (2165843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 2092.

It is an arithmetic number, because the mean of its divisors is an integer number (235620).

2^2165842 is an apocalyptic number.

2165842 is a deficient number, since it is larger than the sum of its proper divisors (1604078).

2165842 is a wasteful number, since it uses less digits than its factorization.

2165842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385.

The product of its digits is 3840, while the sum is 28.

The square root of 2165842 is about 1471.6799923896. The cubic root of 2165842 is about 129.3825154525.

The spelling of 2165842 in words is "two million, one hundred sixty-five thousand, eight hundred forty-two".