2005891 has 4 divisors (see below), whose sum is σ = 2043792. Its totient is φ = 1967992.

The previous prime is 2005879. The next prime is 2005903. The reversal of 2005891 is 1985002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2005879) and next prime (2005903).

It is a cyclic number.

It is not a de Polignac number, because 2005891 - 2⁵ = 2005859 is a prime.

It is a Duffinian number.

2005891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2005831) 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, 18871 + ... + 18976.

It is an arithmetic number, because the mean of its divisors is an integer number (510948).

2^2005891 is an apocalyptic number.

2005891 is a deficient number, since it is larger than the sum of its proper divisors (37901).

2005891 is an equidigital number, since it uses as much as digits as its factorization.

2005891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37900.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2005891 is about 1416.2948139424. The cubic root of 2005891 is about 126.1156869803.

The spelling of 2005891 in words is "two million, five thousand, eight hundred ninety-one".