18306393 has 16 divisors (see below), whose sum is σ = 27995136. Its totient is φ = 10423440.

The previous prime is 18306391. The next prime is 18306403. The reversal of 18306393 is 39360381.

It is not a de Polignac number, because 18306393 - 2¹ = 18306391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18306391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5130 + ... + 7932.

It is an arithmetic number, because the mean of its divisors is an integer number (1749696).

Almost surely, 2^18306393 is an apocalyptic number.

It is an amenable number.

18306393 is a deficient number, since it is larger than the sum of its proper divisors (9688743).

18306393 is a wasteful number, since it uses less digits than its factorization.

18306393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 18306393 is about 4278.5970831570. The cubic root of 18306393 is about 263.5527752984.

The spelling of 18306393 in words is "eighteen million, three hundred six thousand, three hundred ninety-three".