2005391 has 8 divisors (see below), whose sum is σ = 2072400. Its totient is φ = 1939392.

The previous prime is 2005387. The next prime is 2005397. The reversal of 2005391 is 1935002.

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

It is a cyclic number.

It is not a de Polignac number, because 2005391 - 2² = 2005387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6251 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (259050).

2^2005391 is an apocalyptic number.

2005391 is a deficient number, since it is larger than the sum of its proper divisors (67009).

2005391 is a wasteful number, since it uses less digits than its factorization.

2005391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 2005391 is about 1416.1182860199. The cubic root of 2005391 is about 126.1052073342.

The spelling of 2005391 in words is "two million, five thousand, three hundred ninety-one".