2005871 has 4 divisors (see below), whose sum is σ = 2292432. Its totient is φ = 1719312.

The previous prime is 2005859. The next prime is 2005873. The reversal of 2005871 is 1785002.

2005871 = 299² + 300² + ... + 319².

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

It is not a de Polignac number, because 2005871 - 2¹⁸ = 1743727 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 (2005873) 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, 143270 + ... + 143283.

It is an arithmetic number, because the mean of its divisors is an integer number (573108).

2^2005871 is an apocalyptic number.

2005871 is a deficient number, since it is larger than the sum of its proper divisors (286561).

2005871 is an equidigital number, since it uses as much as digits as its factorization.

2005871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286560.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2005871 is about 1416.2877532479. The cubic root of 2005871 is about 126.1152678279.

The spelling of 2005871 in words is "two million, five thousand, eight hundred seventy-one".