23218315 has 4 divisors (see below), whose sum is σ = 27861984. Its totient is φ = 18574648.

The previous prime is 23218313. The next prime is 23218319. The reversal of 23218315 is 51381232.

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

It is a cyclic number.

It is not a de Polignac number, because 23218315 - 2¹ = 23218313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23218315.

It is not an unprimeable number, because it can be changed into a prime (23218313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321827 + ... + 2321836.

It is an arithmetic number, because the mean of its divisors is an integer number (6965496).

Almost surely, 2^23218315 is an apocalyptic number.

23218315 is a deficient number, since it is larger than the sum of its proper divisors (4643669).

23218315 is an equidigital number, since it uses as much as digits as its factorization.

23218315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643668.

The product of its digits is 1440, while the sum is 25.

The square root of 23218315 is about 4818.5386788943. The cubic root of 23218315 is about 285.2836613549.

Adding to 23218315 its reverse (51381232), we get a palindrome (74599547).

The spelling of 23218315 in words is "twenty-three million, two hundred eighteen thousand, three hundred fifteen".