389815020 has 216 divisors, whose sum is σ = 1427890464. Its totient is φ = 84312576.

The previous prime is 389814983. The next prime is 389815033. The reversal of 389815020 is 20518983.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 454432 + ... + 455288.

It is an arithmetic number, because the mean of its divisors is an integer number (6610604).

Almost surely, 2^389815020 is an apocalyptic number.

389815020 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 389815020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713945232).

389815020 is an abundant number, since it is smaller than the sum of its proper divisors (1038075444).

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

389815020 is a wasteful number, since it uses less digits than its factorization.

389815020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 389815020 is about 19743.7336894520. The cubic root of 389815020 is about 730.4988271354.

It can be divided in two parts, 389 and 815020, that added together give a square (815409 = 903²).

The spelling of 389815020 in words is "three hundred eighty-nine million, eight hundred fifteen thousand, twenty".