2172180 has 48 divisors (see below), whose sum is σ = 6237504. Its totient is φ = 564480.

The previous prime is 2172179. The next prime is 2172197. The reversal of 2172180 is 812712.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 2019 + ... + 2901.

It is an arithmetic number, because the mean of its divisors is an integer number (129948).

2^2172180 is an apocalyptic number.

2172180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3118752).

2172180 is an abundant number, since it is smaller than the sum of its proper divisors (4065324).

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

2172180 is a wasteful number, since it uses less digits than its factorization.

2172180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2172180 is about 1473.8317407357. The cubic root of 2172180 is about 129.5085984859.

Adding to 2172180 its reverse (812712), we get a palindrome (2984892).

The spelling of 2172180 in words is "two million, one hundred seventy-two thousand, one hundred eighty".