389309944257780 has 864 divisors, whose sum is σ = 1457419834039680. Its totient is φ = 77118646026240.

The previous prime is 389309944257757. The next prime is 389309944257791. The reversal of 389309944257780 is 87752449903983.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 389309944257696 and 389309944257705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 3454611235 + ... + 3454723925.

It is an arithmetic number, because the mean of its divisors is an integer number (1686828511620).

Almost surely, 2^{389309944257780} is an apocalyptic number.

389309944257780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389309944257780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728709917019840).

389309944257780 is an abundant number, since it is smaller than the sum of its proper divisors (1068109889781900).

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

389309944257780 is a wasteful number, since it uses less digits than its factorization.

389309944257780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113169 (or 113147 counting only the distinct ones).

The product of its (nonzero) digits is 3292047360, while the sum is 78.

The spelling of 389309944257780 in words is "three hundred eighty-nine trillion, three hundred nine billion, nine hundred forty-four million, two hundred fifty-seven thousand, seven hundred eighty".