389990664 has 192 divisors, whose sum is σ = 1262976000. Its totient is φ = 106375680.

The previous prime is 389990609. The next prime is 389990677. The reversal of 389990664 is 466099983.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 389990664.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1702902 + ... + 1703130.

It is an arithmetic number, because the mean of its divisors is an integer number (6578000).

Almost surely, 2^389990664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 389990664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631488000).

389990664 is an abundant number, since it is smaller than the sum of its proper divisors (872985336).

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

389990664 is a wasteful number, since it uses less digits than its factorization.

389990664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 389990664 is about 19748.1812833486. The cubic root of 389990664 is about 730.6085274319.

The spelling of 389990664 in words is "three hundred eighty-nine million, nine hundred ninety thousand, six hundred sixty-four".