389867720 has 64 divisors (see below), whose sum is σ = 962115840. Its totient is φ = 141004800.

The previous prime is 389867717. The next prime is 389867743. The reversal of 389867720 is 27768983.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82625 + ... + 87215.

It is an arithmetic number, because the mean of its divisors is an integer number (15033060).

Almost surely, 2^389867720 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 389867720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481057920).

389867720 is an abundant number, since it is smaller than the sum of its proper divisors (572248120).

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

389867720 is a wasteful number, since it uses less digits than its factorization.

389867720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806 (or 4802 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 389867720 is about 19745.0682450074. The cubic root of 389867720 is about 730.5317449311.

The spelling of 389867720 in words is "three hundred eighty-nine million, eight hundred sixty-seven thousand, seven hundred twenty".