2161982 has 8 divisors (see below), whose sum is σ = 3262896. Its totient is φ = 1074352.

The previous prime is 2161967. The next prime is 2161987. The reversal of 2161982 is 2891612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161987) 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 3 ways as a sum of consecutive naturals, for example, 2903 + ... + 3570.

It is an arithmetic number, because the mean of its divisors is an integer number (407862).

2^2161982 is an apocalyptic number.

2161982 is a deficient number, since it is larger than the sum of its proper divisors (1100914).

2161982 is a wasteful number, since it uses less digits than its factorization.

2161982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642.

The product of its digits is 1728, while the sum is 29.

The square root of 2161982 is about 1470.3679811530. The cubic root of 2161982 is about 129.3056071811.

The spelling of 2161982 in words is "two million, one hundred sixty-one thousand, nine hundred eighty-two".