389971440 has 120 divisors (see below), whose sum is σ = 1366653600. Its totient is φ = 99466752.

The previous prime is 389971427. The next prime is 389971441. The reversal of 389971440 is 44179983.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389971441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4786 + ... + 28334.

It is an arithmetic number, because the mean of its divisors is an integer number (11388780).

Almost surely, 2^389971440 is an apocalyptic number.

389971440 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 389971440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683326800).

389971440 is an abundant number, since it is smaller than the sum of its proper divisors (976682160).

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

389971440 is a wasteful number, since it uses less digits than its factorization.

389971440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23591 (or 23582 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 389971440 is about 19747.6945489847. The cubic root of 389971440 is about 730.5965224871.

The spelling of 389971440 in words is "three hundred eighty-nine million, nine hundred seventy-one thousand, four hundred forty".