18938162397 has 32 divisors (see below), whose sum is σ = 31505854464. Its totient is φ = 9830433600.

The previous prime is 18938162393. The next prime is 18938162413. The reversal of 18938162397 is 79326183981.

It is not a de Polignac number, because 18938162397 - 2² = 18938162393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938162393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275647 + ... + 337427.

It is an arithmetic number, because the mean of its divisors is an integer number (984557952).

Almost surely, 2^18938162397 is an apocalyptic number.

It is an amenable number.

18938162397 is a deficient number, since it is larger than the sum of its proper divisors (12567692067).

18938162397 is a wasteful number, since it uses less digits than its factorization.

18938162397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63129.

The product of its digits is 3919104, while the sum is 57.

The spelling of 18938162397 in words is "eighteen billion, nine hundred thirty-eight million, one hundred sixty-two thousand, three hundred ninety-seven".