2161642 has 16 divisors (see below), whose sum is σ = 3769920. Its totient is φ = 910368.

The previous prime is 2161639. The next prime is 2161697. The reversal of 2161642 is 2461612.

It is a super-2 number, since 2×2161642² = 9345392272328, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 483 + ... + 2134.

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

2^2161642 is an apocalyptic number.

2161642 is a deficient number, since it is larger than the sum of its proper divisors (1608278).

2161642 is a wasteful number, since it uses less digits than its factorization.

2161642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685.

The product of its digits is 576, while the sum is 22.

The square root of 2161642 is about 1470.2523592907. The cubic root of 2161642 is about 129.2988284920.

The spelling of 2161642 in words is "two million, one hundred sixty-one thousand, six hundred forty-two".