2108189 has 4 divisors (see below), whose sum is σ = 2111100. Its totient is φ = 2105280.

The previous prime is 2108177. The next prime is 2108231. The reversal of 2108189 is 9818012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 1582564 = 725^2 + 1258^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108189 - 2²⁰ = 1059613 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (527775).

2^2108189 is an apocalyptic number.

It is an amenable number.

2108189 is a deficient number, since it is larger than the sum of its proper divisors (2911).

2108189 is a wasteful number, since it uses less digits than its factorization.

2108189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2108189 is about 1451.9603989090. The cubic root of 2108189 is about 128.2241555660.

The spelling of 2108189 in words is "two million, one hundred eight thousand, one hundred eighty-nine".