23871 has 8 divisors (see below), whose sum is σ = 32560. Its totient is φ = 15552.

The previous prime is 23869. The next prime is 23873. The reversal of 23871 is 17832.

23871 is a nontrivial binomial coefficient, being equal to C(219, 2).

It is an interprime number because it is at equal distance from previous prime (23869) and next prime (23873).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23871 - 2¹ = 23869 is a prime.

It is an Ulam number.

It is the 155-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23873) by changing a digit.

It is a nontrivial repunit in base 154.

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 7 ways as a sum of consecutive naturals, for example, 165 + ... + 273.

It is an arithmetic number, because the mean of its divisors is an integer number (4070).

2²³⁸⁷¹ is an apocalyptic number.

23871 is the 218-th triangular number.

23871 is a deficient number, since it is larger than the sum of its proper divisors (8689).

23871 is a wasteful number, since it uses less digits than its factorization.

23871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185.

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

The square root of 23871 is about 154.5024271654. The cubic root of 23871 is about 28.7932179246.

The spelling of 23871 in words is "twenty-three thousand, eight hundred seventy-one".