23618 has 12 divisors (see below), whose sum is σ = 41382. Its totient is φ = 10080.

The previous prime is 23609. The next prime is 23623. The reversal of 23618 is 81632.

23618 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in only one way, i.e., 17689 + 5929 = 133^2 + 77^2 .

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

It is a Curzon number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 23618.

It is an unprimeable number.

23618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23 + ... + 218.

2²³⁶¹⁸ is an apocalyptic number.

23618 is a deficient number, since it is larger than the sum of its proper divisors (17764).

23618 is a wasteful number, since it uses less digits than its factorization.

23618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 250 counting only the distinct ones).

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

The square root of 23618 is about 153.6814888007. The cubic root of 23618 is about 28.6911334895.

The spelling of 23618 in words is "twenty-three thousand, six hundred eighteen".