389115978318 has 48 divisors (see below), whose sum is σ = 845468082576. Its totient is φ = 129339129600.

The previous prime is 389115978233. The next prime is 389115978337. The reversal of 389115978318 is 813879511983.

389115978318 is a `hidden beast` number, since 3 + 8 + 9 + 1 + 1 + 597 + 8 + 31 + 8 = 666.

It is a super-2 number, since 2×389115978318² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9881268 + ... + 9920568.

It is an arithmetic number, because the mean of its divisors is an integer number (17613918387).

Almost surely, 2^389115978318 is an apocalyptic number.

389115978318 is an abundant number, since it is smaller than the sum of its proper divisors (456352104258).

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

389115978318 is a wasteful number, since it uses less digits than its factorization.

389115978318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40849 (or 40846 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 389115978318 in words is "three hundred eighty-nine billion, one hundred fifteen million, nine hundred seventy-eight thousand, three hundred eighteen".