389821440 has 176 divisors, whose sum is σ = 1279293120. Its totient is φ = 101253120.

The previous prime is 389821409. The next prime is 389821447. The reversal of 389821440 is 44128983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389821447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 629451 + ... + 630069.

Almost surely, 2^389821440 is an apocalyptic number.

389821440 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 389821440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639646560).

389821440 is an abundant number, since it is smaller than the sum of its proper divisors (889471680).

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

389821440 is a wasteful number, since it uses less digits than its factorization.

389821440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 389821440 is about 19743.8962720128. The cubic root of 389821440 is about 730.5028373937.

The spelling of 389821440 in words is "three hundred eighty-nine million, eight hundred twenty-one thousand, four hundred forty".