18393927393 has 16 divisors (see below), whose sum is σ = 26225012736. Its totient is φ = 11427014400.

The previous prime is 18393927323. The next prime is 18393927397. The reversal of 18393927393 is 39372939381.

It is a happy number.

It is not a de Polignac number, because 18393927393 - 2¹⁷ = 18393796321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18393927397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1780321 + ... + 1790622.

It is an arithmetic number, because the mean of its divisors is an integer number (1639063296).

Almost surely, 2^18393927393 is an apocalyptic number.

It is an amenable number.

18393927393 is a deficient number, since it is larger than the sum of its proper divisors (7831085343).

18393927393 is a wasteful number, since it uses less digits than its factorization.

18393927393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571064.

The product of its digits is 6613488, while the sum is 57.

The spelling of 18393927393 in words is "eighteen billion, three hundred ninety-three million, nine hundred twenty-seven thousand, three hundred ninety-three".