2161946 has 4 divisors (see below), whose sum is σ = 3242922. Its totient is φ = 1080972.

The previous prime is 2161933. The next prime is 2161949. The reversal of 2161946 is 6491612.

2161946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 748225 = 1189^2 + 865^2 .

It is not an unprimeable number, because it can be changed into a prime (2161949) by changing a digit.

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 as a sum of consecutive naturals, namely, 540485 + ... + 540488.

2^2161946 is an apocalyptic number.

2161946 is a deficient number, since it is larger than the sum of its proper divisors (1080976).

2161946 is a wasteful number, since it uses less digits than its factorization.

2161946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080975.

The product of its digits is 2592, while the sum is 29.

The square root of 2161946 is about 1470.3557392686. The cubic root of 2161946 is about 129.3048894712.

The spelling of 2161946 in words is "two million, one hundred sixty-one thousand, nine hundred forty-six".