2171688 has 32 divisors (see below), whose sum is σ = 5564160. Its totient is φ = 705920.

The previous prime is 2171657. The next prime is 2171707. The reversal of 2171688 is 8861712.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 120 + ... + 2087.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2^2171688 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 2171688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2782080).

2171688 is an abundant number, since it is smaller than the sum of its proper divisors (3392472).

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

2171688 is a wasteful number, since it uses less digits than its factorization.

2171688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257 (or 2253 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 2171688 is about 1473.6648194213. The cubic root of 2171688 is about 129.4988198240.

The spelling of 2171688 in words is "two million, one hundred seventy-one thousand, six hundred eighty-eight".