42871 has 4 divisors (see below), whose sum is σ = 43912. Its totient is φ = 41832.

The previous prime is 42863. The next prime is 42899. The reversal of 42871 is 17824.

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

It is a cyclic number.

It is not a de Polignac number, because 42871 - 2³ = 42863 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8 and base 13.

It is a nialpdrome in base 15 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42821) 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, 456 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (10978).

2⁴²⁸⁷¹ is an apocalyptic number.

42871 is a deficient number, since it is larger than the sum of its proper divisors (1041).

42871 is an equidigital number, since it uses as much as digits as its factorization.

42871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its digits is 448, while the sum is 22.

The square root of 42871 is about 207.0531332774. The cubic root of 42871 is about 34.9989115308.

Subtracting from 42871 its sum of digits (22), we obtain a square (42849 = 207²).

The spelling of 42871 in words is "forty-two thousand, eight hundred seventy-one".