1389312056 has 64 divisors (see below), whose sum is σ = 3006270720. Its totient is φ = 595710720.

The previous prime is 1389312013. The next prime is 1389312073. The reversal of 1389312056 is 6502139831.

It is a happy number.

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, 143051 + ... + 152453.

It is an arithmetic number, because the mean of its divisors is an integer number (46972980).

Almost surely, 2^1389312056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389312056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1503135360).

1389312056 is an abundant number, since it is smaller than the sum of its proper divisors (1616958664).

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

1389312056 is a wasteful number, since it uses less digits than its factorization.

1389312056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9516 (or 9512 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1389312056 is about 37273.4765751734. The cubic root of 1389312056 is about 1115.8348847672.

The spelling of 1389312056 in words is "one billion, three hundred eighty-nine million, three hundred twelve thousand, fifty-six".