2173220 has 72 divisors (see below), whose sum is σ = 5632704. Its totient is φ = 689472.

The previous prime is 2173219. The next prime is 2173243. The reversal of 2173220 is 223712.

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 23 ways as a sum of consecutive naturals, for example, 50519 + ... + 50561.

It is an arithmetic number, because the mean of its divisors is an integer number (78232).

2^2173220 is an apocalyptic number.

2173220 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 2173220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2816352).

2173220 is an abundant number, since it is smaller than the sum of its proper divisors (3459484).

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

2173220 is a wasteful number, since it uses less digits than its factorization.

2173220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2173220 is about 1474.1845203366. The cubic root of 2173220 is about 129.5292639699.

Adding to 2173220 its reverse (223712), we get a palindrome (2396932).

The spelling of 2173220 in words is "two million, one hundred seventy-three thousand, two hundred twenty".