23818 has 4 divisors (see below), whose sum is σ = 35730. Its totient is φ = 11908.

The previous prime is 23813. The next prime is 23819. The reversal of 23818 is 81832.

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., 21609 + 2209 = 147^2 + 47^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (23813) 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 as a sum of consecutive naturals, namely, 5953 + ... + 5956.

2²³⁸¹⁸ is an apocalyptic number.

23818 is a deficient number, since it is larger than the sum of its proper divisors (11912).

23818 is a wasteful number, since it uses less digits than its factorization.

23818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911.

The product of its digits is 384, while the sum is 22.

The square root of 23818 is about 154.3308135143. The cubic root of 23818 is about 28.7718925877.

It can be divided in two parts, 238 and 18, that added together give a 8-th power (256 = 2⁸).

The spelling of 23818 in words is "twenty-three thousand, eight hundred eighteen".