23856 has 40 divisors (see below), whose sum is σ = 71424. Its totient is φ = 6720.

The previous prime is 23833. The next prime is 23857. The reversal of 23856 is 65832.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a d-powerful number, because it can be written as 2⁴ + 3⁹ + 8⁴ + 5² + 6² .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (23857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 371.

2²³⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35712).

23856 is an abundant number, since it is smaller than the sum of its proper divisors (47568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23856 is a wasteful number, since it uses less digits than its factorization.

23856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 83 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 23856 is about 154.4538766105. The cubic root of 23856 is about 28.7871856572.

Subtracting from 23856 its sum of digits (24), we obtain a palindrome (23832).

The spelling of 23856 in words is "twenty-three thousand, eight hundred fifty-six".