18349393 has 4 divisors (see below), whose sum is σ = 18538660. Its totient is φ = 18160128.

The previous prime is 18349381. The next prime is 18349417. The reversal of 18349393 is 39394381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11075584 + 7273809 = 3328^2 + 2697^2 .

It is a cyclic number.

It is not a de Polignac number, because 18349393 - 2⁵ = 18349361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18349333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94488 + ... + 94681.

It is an arithmetic number, because the mean of its divisors is an integer number (4634665).

Almost surely, 2^18349393 is an apocalyptic number.

It is an amenable number.

18349393 is a deficient number, since it is larger than the sum of its proper divisors (189267).

18349393 is an equidigital number, since it uses as much as digits as its factorization.

18349393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189266.

The product of its digits is 69984, while the sum is 40.

The square root of 18349393 is about 4283.6191474033. The cubic root of 18349393 is about 263.7589675230.

The spelling of 18349393 in words is "eighteen million, three hundred forty-nine thousand, three hundred ninety-three".