203871 has 4 divisors (see below), whose sum is σ = 271832. Its totient is φ = 135912.

The previous prime is 203869. The next prime is 203873. The reversal of 203871 is 178302.

203871 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 (203869) and next prime (203873).

It is not a de Polignac number, because 203871 - 2¹ = 203869 is a prime.

It is a D-number.

It is a Duffinian number.

203871 is strictly pandigital in base 7.

203871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203873) 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 3 ways as a sum of consecutive naturals, for example, 33976 + ... + 33981.

It is an arithmetic number, because the mean of its divisors is an integer number (67958).

2²⁰³⁸⁷¹ is an apocalyptic number.

203871 is a deficient number, since it is larger than the sum of its proper divisors (67961).

203871 is an equidigital number, since it uses as much as digits as its factorization.

203871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67960.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 203871 is about 451.5207636422. The cubic root of 203871 is about 58.8552421745.

The spelling of 203871 in words is "two hundred three thousand, eight hundred seventy-one".