18006393 has 4 divisors (see below), whose sum is σ = 24008528. Its totient is φ = 12004260.

The previous prime is 18006389. The next prime is 18006413. The reversal of 18006393 is 39360081.

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 not a de Polignac number, because 18006393 - 2² = 18006389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18006393.

It is not an unprimeable number, because it can be changed into a prime (18006323) 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 3 ways as a sum of consecutive naturals, for example, 3001063 + ... + 3001068.

It is an arithmetic number, because the mean of its divisors is an integer number (6002132).

Almost surely, 2^18006393 is an apocalyptic number.

It is an amenable number.

18006393 is a deficient number, since it is larger than the sum of its proper divisors (6002135).

18006393 is an equidigital number, since it uses as much as digits as its factorization.

18006393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002134.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 18006393 is about 4243.3940425089. The cubic root of 18006393 is about 262.1051624146.

The spelling of 18006393 in words is "eighteen million, six thousand, three hundred ninety-three".