2170806 has 32 divisors (see below), whose sum is σ = 4893696. Its totient is φ = 636000.

The previous prime is 2170783. The next prime is 2170813. The reversal of 2170806 is 6080712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516 + ... + 2576.

It is an arithmetic number, because the mean of its divisors is an integer number (152928).

2^2170806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2170806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2446848).

2170806 is an abundant number, since it is smaller than the sum of its proper divisors (2722890).

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

2170806 is a wasteful number, since it uses less digits than its factorization.

2170806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 2170806 is about 1473.3655350930. The cubic root of 2170806 is about 129.4812860860.

The spelling of 2170806 in words is "two million, one hundred seventy thousand, eight hundred six".