18000393 has 8 divisors (see below), whose sum is σ = 24024000. Its totient is φ = 11988528.

The previous prime is 18000371. The next prime is 18000397. The reversal of 18000393 is 39300081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18000393 - 2⁸ = 18000137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18000397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1683 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (3003000).

Almost surely, 2^18000393 is an apocalyptic number.

It is an amenable number.

18000393 is a deficient number, since it is larger than the sum of its proper divisors (6023607).

18000393 is a wasteful number, since it uses less digits than its factorization.

18000393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 18000393 is about 4242.6870023607. The cubic root of 18000393 is about 262.0760467244.

The spelling of 18000393 in words is "eighteen million, three hundred ninety-three", and thus it is an aban number.