2155656 has 16 divisors (see below), whose sum is σ = 5389200. Its totient is φ = 718544.

The previous prime is 2155639. The next prime is 2155661. The reversal of 2155656 is 6565512.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 44886 + ... + 44933.

It is an arithmetic number, because the mean of its divisors is an integer number (336825).

2^2155656 is an apocalyptic number.

It is an amenable number.

2155656 is an abundant number, since it is smaller than the sum of its proper divisors (3233544).

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

2155656 is a wasteful number, since it uses less digits than its factorization.

2155656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89828 (or 89824 counting only the distinct ones).

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

The square root of 2155656 is about 1468.2152430758. The cubic root of 2155656 is about 129.1793670943.

It can be divided in two parts, 21556 and 56, that added together give a palindrome (21612).

The spelling of 2155656 in words is "two million, one hundred fifty-five thousand, six hundred fifty-six".