18395839919 has 8 divisors (see below), whose sum is σ = 19383177840. Its totient is φ = 17410415616.

The previous prime is 18395839909. The next prime is 18395839951. The reversal of 18395839919 is 91993859381.

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

It is a de Polignac number, because none of the positive numbers 2^k-18395839919 is a prime.

It is a super-2 number, since 2×18395839919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18395839909) 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 7 ways as a sum of consecutive naturals, for example, 458642 + ... + 497135.

It is an arithmetic number, because the mean of its divisors is an integer number (2422897230).

Almost surely, 2^18395839919 is an apocalyptic number.

18395839919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18395839919 is a deficient number, since it is larger than the sum of its proper divisors (987337921).

18395839919 is a wasteful number, since it uses less digits than its factorization.

18395839919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956809.

The product of its digits is 18895680, while the sum is 65.

The spelling of 18395839919 in words is "eighteen billion, three hundred ninety-five million, eight hundred thirty-nine thousand, nine hundred nineteen".