2165556 has 12 divisors (see below), whose sum is σ = 5052992. Its totient is φ = 721848.

The previous prime is 2165551. The next prime is 2165557. The reversal of 2165556 is 6555612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165551) 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, 90220 + ... + 90243.

2^2165556 is an apocalyptic number.

It is an amenable number.

2165556 is an abundant number, since it is smaller than the sum of its proper divisors (2887436).

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

2165556 is a wasteful number, since it uses less digits than its factorization.

2165556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180470 (or 180468 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 2165556 is about 1471.5828213186. The cubic root of 2165556 is about 129.3768202036.

The spelling of 2165556 in words is "two million, one hundred sixty-five thousand, five hundred fifty-six".