389638860 has 192 divisors, whose sum is σ = 1261274112. Its totient is φ = 89109504.

The previous prime is 389638853. The next prime is 389638913. The reversal of 389638860 is 68836983.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 663487 + ... + 664073.

It is an arithmetic number, because the mean of its divisors is an integer number (6569136).

Almost surely, 2^389638860 is an apocalyptic number.

389638860 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 389638860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (630637056).

389638860 is an abundant number, since it is smaller than the sum of its proper divisors (871635252).

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

389638860 is a wasteful number, since it uses less digits than its factorization.

389638860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 389638860 is about 19739.2720230509. The cubic root of 389638860 is about 730.3887714628.

The spelling of 389638860 in words is "three hundred eighty-nine million, six hundred thirty-eight thousand, eight hundred sixty".