389907840 has 256 divisors, whose sum is σ = 1444907520. Its totient is φ = 87588864.

The previous prime is 389907829. The next prime is 389907841. The reversal of 389907840 is 48709983.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 389907840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389907841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 900264 + ... + 900696.

It is an arithmetic number, because the mean of its divisors is an integer number (5644170).

Almost surely, 2^389907840 is an apocalyptic number.

389907840 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 389907840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722453760).

389907840 is an abundant number, since it is smaller than the sum of its proper divisors (1054999680).

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

389907840 is a wasteful number, since it uses less digits than its factorization.

389907840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 389907840 is about 19746.0841687662. The cubic root of 389907840 is about 730.5568029416.

The spelling of 389907840 in words is "three hundred eighty-nine million, nine hundred seven thousand, eight hundred forty".