18233730393 has 8 divisors (see below), whose sum is σ = 24710192256. Its totient is φ = 11956544400.

The previous prime is 18233730353. The next prime is 18233730421. The reversal of 18233730393 is 39303733281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18233730393 - 2⁹ = 18233729881 is a prime.

It is a super-2 number, since 2×18233730393² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18233730353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49818753 + ... + 49819118.

It is an arithmetic number, because the mean of its divisors is an integer number (3088774032).

Almost surely, 2^18233730393 is an apocalyptic number.

It is an amenable number.

18233730393 is a deficient number, since it is larger than the sum of its proper divisors (6476461863).

18233730393 is an equidigital number, since it uses as much as digits as its factorization.

18233730393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99637935.

The product of its (nonzero) digits is 244944, while the sum is 42.

The spelling of 18233730393 in words is "eighteen billion, two hundred thirty-three million, seven hundred thirty thousand, three hundred ninety-three".