1389985056 has 96 divisors (see below), whose sum is σ = 4080343680. Its totient is φ = 460332288.

The previous prime is 1389985027. The next prime is 1389985057. The reversal of 1389985056 is 6505899831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a junction number, because it is equal to n+sod(n) for n = 1389984993 and 1389985011.

It is not an unprimeable number, because it can be changed into a prime (1389985057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130525 + ... + 140771.

It is an arithmetic number, because the mean of its divisors is an integer number (42503580).

Almost surely, 2^1389985056 is an apocalyptic number.

1389985056 is a gapful number since it is divisible by the number (16) 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 1389985056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2040171840).

1389985056 is an abundant number, since it is smaller than the sum of its proper divisors (2690358624).

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

1389985056 is a wasteful number, since it uses less digits than its factorization.

1389985056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10423 (or 10409 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The square root of 1389985056 is about 37282.5033494265. The cubic root of 1389985056 is about 1116.0150304369.

The spelling of 1389985056 in words is "one billion, three hundred eighty-nine million, nine hundred eighty-five thousand, fifty-six".