223871 has 4 divisors (see below), whose sum is σ = 225144. Its totient is φ = 222600.

The previous prime is 223849. The next prime is 223903. The reversal of 223871 is 178322.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223871 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 (223831) 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 3 ways as a sum of consecutive naturals, for example, 320 + ... + 741.

It is an arithmetic number, because the mean of its divisors is an integer number (56286).

2²²³⁸⁷¹ is an apocalyptic number.

223871 is a deficient number, since it is larger than the sum of its proper divisors (1273).

223871 is a wasteful number, since it uses less digits than its factorization.

223871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its digits is 672, while the sum is 23.

The square root of 223871 is about 473.1500818979. The cubic root of 223871 is about 60.7201188662.

The spelling of 223871 in words is "two hundred twenty-three thousand, eight hundred seventy-one".