2158170 has 64 divisors (see below), whose sum is σ = 6082560. Its totient is φ = 479808.

The previous prime is 2158157. The next prime is 2158171. The reversal of 2158170 is 718512.

2158170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2158170.

It is not an unprimeable number, because it can be changed into a prime (2158171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8911 + ... + 9149.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2^2158170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3041280).

2158170 is an abundant number, since it is smaller than the sum of its proper divisors (3924390).

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

2158170 is a wasteful number, since it uses less digits than its factorization.

2158170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 2158170 is about 1469.0711351054. The cubic root of 2158170 is about 129.2295653887.

It can be divided in two parts, 215 and 8170, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 2158170 in words is "two million, one hundred fifty-eight thousand, one hundred seventy".