1389255648 has 96 divisors (see below), whose sum is σ = 3994583040. Its totient is φ = 419266560.

The previous prime is 1389255641. The next prime is 1389255671. The reversal of 1389255648 is 8465529831.

1389255648 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

Its product of digits (2073600) is a multiple of the sum of its prime factors (5400).

It is a self number, because there is not a number n which added to its sum of digits gives 1389255648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389255641) 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, 268833 + ... + 273951.

It is an arithmetic number, because the mean of its divisors is an integer number (41610240).

Almost surely, 2^1389255648 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 1389255648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1997291520).

1389255648 is an abundant number, since it is smaller than the sum of its proper divisors (2605327392).

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

1389255648 is a wasteful number, since it uses less digits than its factorization.

1389255648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400 (or 5392 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 51.

The square root of 1389255648 is about 37272.7198900214. The cubic root of 1389255648 is about 1115.8197830805.

The spelling of 1389255648 in words is "one billion, three hundred eighty-nine million, two hundred fifty-five thousand, six hundred forty-eight".