23218393 has 4 divisors (see below), whose sum is σ = 25329168. Its totient is φ = 21107620.

The previous prime is 23218387. The next prime is 23218397. The reversal of 23218393 is 39381232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23218393 - 2²¹ = 21121241 is a prime.

It is a super-3 number, since 3×23218393³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23218397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055371 + ... + 1055392.

It is an arithmetic number, because the mean of its divisors is an integer number (6332292).

Almost surely, 2^23218393 is an apocalyptic number.

It is an amenable number.

23218393 is a deficient number, since it is larger than the sum of its proper divisors (2110775).

23218393 is a wasteful number, since it uses less digits than its factorization.

23218393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110774.

The product of its digits is 7776, while the sum is 31.

The square root of 23218393 is about 4818.5467726276. The cubic root of 23218393 is about 285.2839808168.

The spelling of 23218393 in words is "twenty-three million, two hundred eighteen thousand, three hundred ninety-three".