2172205188 has 72 divisors (see below), whose sum is σ = 5706439648. Its totient is φ = 722514816.

The previous prime is 2172205187. The next prime is 2172205193. The reversal of 2172205188 is 8815022712.

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

It is not an unprimeable number, because it can be changed into a prime (2172205187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 506220 + ... + 510492.

Almost surely, 2^2172205188 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 2172205188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2853219824).

2172205188 is an abundant number, since it is smaller than the sum of its proper divisors (3534234460).

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

2172205188 is a wasteful number, since it uses less digits than its factorization.

2172205188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815 (or 4801 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 2172205188 is about 46606.9221039107. The cubic root of 2172205188 is about 1295.0909906599.

The spelling of 2172205188 in words is "two billion, one hundred seventy-two million, two hundred five thousand, one hundred eighty-eight".