389840256 has 128 divisors (see below), whose sum is σ = 1239218400. Its totient is φ = 119937024.

The previous prime is 389840249. The next prime is 389840261. The reversal of 389840256 is 652048983.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent 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, 40590 + ... + 49266.

Almost surely, 2^389840256 is an apocalyptic number.

389840256 is a gapful number since it is divisible by the number (36) 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 389840256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (619609200).

389840256 is an abundant number, since it is smaller than the sum of its proper divisors (849378144).

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

389840256 is a wasteful number, since it uses less digits than its factorization.

389840256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713 (or 8695 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 389840256 is about 19744.3727679559. The cubic root of 389840256 is about 730.5145905699.

The spelling of 389840256 in words is "three hundred eighty-nine million, eight hundred forty thousand, two hundred fifty-six".