2165956 has 24 divisors (see below), whose sum is σ = 4261824. Its totient is φ = 955680.

The previous prime is 2165941. The next prime is 2165957. The reversal of 2165956 is 6595612.

It is a happy number.

It is a nialpdrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165957) 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, 291 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (177576).

2^2165956 is an apocalyptic number.

2165956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2165956 is a deficient number, since it is larger than the sum of its proper divisors (2095868).

2165956 is a wasteful number, since it uses less digits than its factorization.

2165956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851 (or 1849 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The square root of 2165956 is about 1471.7187231261. The cubic root of 2165956 is about 129.3847854470.

The spelling of 2165956 in words is "two million, one hundred sixty-five thousand, nine hundred fifty-six".