18111393 has 12 divisors (see below), whose sum is σ = 26336128. Its totient is φ = 11993400.

The previous prime is 18111361. The next prime is 18111437. The reversal of 18111393 is 39311181.

It is a happy number.

It is not a de Polignac number, because 18111393 - 2⁵ = 18111361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18111893) 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 11 ways as a sum of consecutive naturals, for example, 5305 + ... + 8022.

Almost surely, 2^18111393 is an apocalyptic number.

It is an amenable number.

18111393 is a deficient number, since it is larger than the sum of its proper divisors (8224735).

18111393 is a wasteful number, since it uses less digits than its factorization.

18111393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13484 (or 13481 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 18111393 is about 4255.7482303351. The cubic root of 18111393 is about 262.6136433107.

The spelling of 18111393 in words is "eighteen million, one hundred eleven thousand, three hundred ninety-three".