389128740 has 576 divisors, whose sum is σ = 1601617920. Its totient is φ = 68428800.

The previous prime is 389128711. The next prime is 389128783. The reversal of 389128740 is 47821983.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 389128692 and 389128701.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 12552525 + ... + 12552555.

Almost surely, 2^389128740 is an apocalyptic number.

389128740 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 389128740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800808960).

389128740 is an abundant number, since it is smaller than the sum of its proper divisors (1212489180).

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

389128740 is a wasteful number, since it uses less digits than its factorization.

389128740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 389128740 is about 19726.3463418850. The cubic root of 389128740 is about 730.0698875981.

The spelling of 389128740 in words is "three hundred eighty-nine million, one hundred twenty-eight thousand, seven hundred forty".