23128393 has 4 divisors (see below), whose sum is σ = 23139460. Its totient is φ = 23117328.

The previous prime is 23128379. The next prime is 23128397. The reversal of 23128393 is 39382132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19430464 + 3697929 = 4408^2 + 1923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23128393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23128397) 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, 1338 + ... + 6931.

It is an arithmetic number, because the mean of its divisors is an integer number (5784865).

Almost surely, 2^23128393 is an apocalyptic number.

It is an amenable number.

23128393 is a deficient number, since it is larger than the sum of its proper divisors (11067).

23128393 is an equidigital number, since it uses as much as digits as its factorization.

23128393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066.

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

The square root of 23128393 is about 4809.1987898194. The cubic root of 23128393 is about 284.9148940508.

The spelling of 23128393 in words is "twenty-three million, one hundred twenty-eight thousand, three hundred ninety-three".