1389032568 has 144 divisors (see below), whose sum is σ = 4725979440. Its totient is φ = 360771840.

The previous prime is 1389032551. The next prime is 1389032581. The reversal of 1389032568 is 8652309831.

It is a happy number.

1389032568 is a `hidden beast` number, since 1 + 3 + 89 + 0 + 3 + 2 + 568 = 666.

1389032568 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1389032568² = 3858822949929349248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49596 + ... + 72372.

Almost surely, 2^1389032568 is an apocalyptic number.

1389032568 is a gapful number since it is divisible by the number (18) 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 1389032568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2362989720).

1389032568 is an abundant number, since it is smaller than the sum of its proper divisors (3336946872).

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

1389032568 is a wasteful number, since it uses less digits than its factorization.

1389032568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22818 (or 22800 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1389032568 is about 37269.7272327019. The cubic root of 1389032568 is about 1115.7600555562.

The spelling of 1389032568 in words is "one billion, three hundred eighty-nine million, thirty-two thousand, five hundred sixty-eight".