18765905838 has 16 divisors (see below), whose sum is σ = 39739565520. Its totient is φ = 5887342976.

The previous prime is 18765905801. The next prime is 18765905857. The reversal of 18765905838 is 83850956781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91989633 + ... + 91989836.

It is an arithmetic number, because the mean of its divisors is an integer number (2483722845).

Almost surely, 2^18765905838 is an apocalyptic number.

18765905838 is an abundant number, since it is smaller than the sum of its proper divisors (20973659682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18765905838 is a wasteful number, since it uses less digits than its factorization.

18765905838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183979491.

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 18765905838 in words is "eighteen billion, seven hundred sixty-five million, nine hundred five thousand, eight hundred thirty-eight".