2161756 has 12 divisors (see below), whose sum is σ = 3831520. Its totient is φ = 1067040.

The previous prime is 2161751. The next prime is 2161759. The reversal of 2161756 is 6571612.

2161756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161751) 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 in 3 ways as a sum of consecutive naturals, for example, 3105 + ... + 3736.

2^2161756 is an apocalyptic number.

It is an amenable number.

2161756 is a deficient number, since it is larger than the sum of its proper divisors (1669764).

2161756 is a wasteful number, since it uses less digits than its factorization.

2161756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924 (or 6922 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 2161756 is about 1470.2911276343. The cubic root of 2161756 is about 129.3011014258.

The spelling of 2161756 in words is "two million, one hundred sixty-one thousand, seven hundred fifty-six".