2165964 has 12 divisors (see below), whose sum is σ = 5053944. Its totient is φ = 721984.

The previous prime is 2165963. The next prime is 2165971. The reversal of 2165964 is 4695612.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2165963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90237 + ... + 90260.

It is an arithmetic number, because the mean of its divisors is an integer number (421162).

2^2165964 is an apocalyptic number.

It is an amenable number.

2165964 is an abundant number, since it is smaller than the sum of its proper divisors (2887980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165964 is a wasteful number, since it uses less digits than its factorization.

2165964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180504 (or 180502 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 2165964 is about 1471.7214410343. The cubic root of 2165964 is about 129.3849447419.

The spelling of 2165964 in words is "two million, one hundred sixty-five thousand, nine hundred sixty-four".