18118393 has 4 divisors (see below), whose sum is σ = 18130320. Its totient is φ = 18106468.

The previous prime is 18118367. The next prime is 18118469. The reversal of 18118393 is 39381181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18118393 - 2⁵ = 18118361 is a prime.

It is a super-3 number, since 3×18118393³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18118193) 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, 3283 + ... + 6856.

It is an arithmetic number, because the mean of its divisors is an integer number (4532580).

Almost surely, 2^18118393 is an apocalyptic number.

It is an amenable number.

18118393 is a deficient number, since it is larger than the sum of its proper divisors (11927).

18118393 is a wasteful number, since it uses less digits than its factorization.

18118393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11926.

The product of its digits is 5184, while the sum is 34.

The square root of 18118393 is about 4256.5705679573. The cubic root of 18118393 is about 262.6474720858.

The spelling of 18118393 in words is "eighteen million, one hundred eighteen thousand, three hundred ninety-three".