18345393 has 32 divisors (see below), whose sum is σ = 31219200. Its totient is φ = 10530000.

The previous prime is 18345389. The next prime is 18345403. The reversal of 18345393 is 39354381.

It is not a de Polignac number, because 18345393 - 2² = 18345389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18345343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4018 + ... + 7268.

It is an arithmetic number, because the mean of its divisors is an integer number (975600).

Almost surely, 2^18345393 is an apocalyptic number.

It is an amenable number.

18345393 is a deficient number, since it is larger than the sum of its proper divisors (12873807).

18345393 is a wasteful number, since it uses less digits than its factorization.

18345393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 3284 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 18345393 is about 4283.1522270403. The cubic root of 18345393 is about 263.7398004486.

It can be divided in two parts, 1834 and 5393, that added together give a palindrome (7227).

The spelling of 18345393 in words is "eighteen million, three hundred forty-five thousand, three hundred ninety-three".