2173656 has 48 divisors (see below), whose sum is σ = 5687640. Its totient is φ = 691840.

The previous prime is 2173651. The next prime is 2173663. The reversal of 2173656 is 6563712.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46225 + ... + 46271.

2^2173656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2173656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843820).

2173656 is an abundant number, since it is smaller than the sum of its proper divisors (3513984).

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

2173656 is a wasteful number, since it uses less digits than its factorization.

2173656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 93 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 2173656 is about 1474.3323912877. The cubic root of 2173656 is about 129.5379256152.

The spelling of 2173656 in words is "two million, one hundred seventy-three thousand, six hundred fifty-six".