2188656 has 30 divisors (see below), whose sum is σ = 6125600. Its totient is φ = 729504.

The previous prime is 2188651. The next prime is 2188663. The reversal of 2188656 is 6568812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2188656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7456 + ... + 7743.

2^2188656 is an apocalyptic number.

It is an amenable number.

2188656 is an abundant number, since it is smaller than the sum of its proper divisors (3936944).

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

2188656 is a wasteful number, since it uses less digits than its factorization.

2188656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15213 (or 15204 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2188656 is about 1479.4106934858. The cubic root of 2188656 is about 129.8352152744.

The spelling of 2188656 in words is "two million, one hundred eighty-eight thousand, six hundred fifty-six".