2173206 has 32 divisors (see below), whose sum is σ = 5057280. Its totient is φ = 609696.

The previous prime is 2173183. The next prime is 2173207. The reversal of 2173206 is 6023712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (158040).

2^2173206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2173206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2528640).

2173206 is an abundant number, since it is smaller than the sum of its proper divisors (2884074).

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

2173206 is a wasteful number, since it uses less digits than its factorization.

2173206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2173206 is about 1474.1797719410. The cubic root of 2173206 is about 129.5289858244.

Adding to 2173206 its reverse (6023712), we get a palindrome (8196918).

The spelling of 2173206 in words is "two million, one hundred seventy-three thousand, two hundred six".