23906 has 4 divisors (see below), whose sum is σ = 35862. Its totient is φ = 11952.

The previous prime is 23899. The next prime is 23909. The reversal of 23906 is 60932.

23906 = 39² + 40² + ... + 50².

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15625 + 8281 = 125^2 + 91^2 .

It is not an unprimeable number, because it can be changed into a prime (23909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5975 + ... + 5978.

2²³⁹⁰⁶ is an apocalyptic number.

23906 is a deficient number, since it is larger than the sum of its proper divisors (11956).

23906 is a wasteful number, since it uses less digits than its factorization.

23906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11955.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 23906 is about 154.6156525065. The cubic root of 23906 is about 28.8072833945.

It can be divided in two parts, 23 and 906, that added together give a palindrome (929).

The spelling of 23906 in words is "twenty-three thousand, nine hundred six".