23861 has 4 divisors (see below), whose sum is σ = 24192. Its totient is φ = 23532.

The previous prime is 23857. The next prime is 23869. The reversal of 23861 is 16832.

23861 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23861 - 2² = 23857 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 (23869) 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, 5 + ... + 218.

It is an arithmetic number, because the mean of its divisors is an integer number (6048).

2²³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

23861 is a deficient number, since it is larger than the sum of its proper divisors (331).

23861 is a wasteful number, since it uses less digits than its factorization.

23861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its digits is 288, while the sum is 20.

The square root of 23861 is about 154.4700618243. The cubic root of 23861 is about 28.7891966939.

The spelling of 23861 in words is "twenty-three thousand, eight hundred sixty-one".