23418 has 12 divisors (see below), whose sum is σ = 50778. Its totient is φ = 7800.

The previous prime is 23417. The next prime is 23431. The reversal of 23418 is 81432.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23409 + 9 = 153^2 + 3^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1301 = 23418 / (2 + 3 + 4 + 1 + 8).

It is a fibodiv number, since the Fibonacci-like sequence with seeds 234 and 18 contains 23418 itself.

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

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 23418.

It is not an unprimeable number, because it can be changed into a prime (23417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 633 + ... + 668.

2²³⁴¹⁸ is an apocalyptic number.

23418 is an abundant number, since it is smaller than the sum of its proper divisors (27360).

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

23418 is a wasteful number, since it uses less digits than its factorization.

23418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309 (or 1306 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 23418 is about 153.0294089383. The cubic root of 23418 is about 28.6099171763.

Adding to 23418 its sum of digits (18), we get a triangular number (23436 = T₂₁₆).

It can be divided in two parts, 234 and 18, that added together give a palindrome (252).

The spelling of 23418 in words is "twenty-three thousand, four hundred eighteen".