23218349 has 32 divisors (see below), whose sum is σ = 30523392. Its totient is φ = 17136000.

The previous prime is 23218343. The next prime is 23218373. The reversal of 23218349 is 94381232.

It is a happy number.

It is not a de Polignac number, because 23218349 - 2⁴ = 23218333 is a prime.

It is a Smith number, since the sum of its digits (32) 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 a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23218343) 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 31 ways as a sum of consecutive naturals, for example, 169409 + ... + 169545.

It is an arithmetic number, because the mean of its divisors is an integer number (953856).

Almost surely, 2^23218349 is an apocalyptic number.

It is an amenable number.

23218349 is a deficient number, since it is larger than the sum of its proper divisors (7305043).

23218349 is a wasteful number, since it uses less digits than its factorization.

23218349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its digits is 10368, while the sum is 32.

The square root of 23218349 is about 4818.5422069335. The cubic root of 23218349 is about 285.2838006076.

It can be divided in two parts, 232183 and 49, that added together give a palindrome (232232).

The spelling of 23218349 in words is "twenty-three million, two hundred eighteen thousand, three hundred forty-nine".