2108391 has 8 divisors (see below), whose sum is σ = 2976624. Its totient is φ = 1322880.

The previous prime is 2108389. The next prime is 2108401. The reversal of 2108391 is 1938012.

2108391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2108391 - 2¹ = 2108389 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2108391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108291) 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 7 ways as a sum of consecutive naturals, for example, 20620 + ... + 20721.

It is an arithmetic number, because the mean of its divisors is an integer number (372078).

2^2108391 is an apocalyptic number.

2108391 is a deficient number, since it is larger than the sum of its proper divisors (868233).

2108391 is a wasteful number, since it uses less digits than its factorization.

2108391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41361.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2108391 is about 1452.0299583686. The cubic root of 2108391 is about 128.2282507795.

The spelling of 2108391 in words is "two million, one hundred eight thousand, three hundred ninety-one".