389631338640 has 400 divisors, whose sum is σ = 1462987225920. Its totient is φ = 95771704320.

The previous prime is 389631338627. The next prime is 389631338671. The reversal of 389631338640 is 46833136983.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4512675 + ... + 4598205.

Almost surely, 2^389631338640 is an apocalyptic number.

389631338640 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 389631338640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731493612960).

389631338640 is an abundant number, since it is smaller than the sum of its proper divisors (1073355887280).

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

389631338640 is a wasteful number, since it uses less digits than its factorization.

389631338640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85612 (or 85597 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 389631338640 in words is "three hundred eighty-nine billion, six hundred thirty-one million, three hundred thirty-eight thousand, six hundred forty".