1389519340638 has 128 divisors (see below), whose sum is σ = 3468752017920. Its totient is φ = 365131307520.

The previous prime is 1389519340637. The next prime is 1389519340661. The reversal of 1389519340638 is 8360439159831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389519340633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165981 + ... + 1675287.

It is an arithmetic number, because the mean of its divisors is an integer number (27099625140).

Almost surely, 2^{1389519340638} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389519340638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734376008960).

1389519340638 is an abundant number, since it is smaller than the sum of its proper divisors (2079232677282).

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

1389519340638 is a wasteful number, since it uses less digits than its factorization.

1389519340638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509402.

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 1389519340638 in words is "one trillion, three hundred eighty-nine billion, five hundred nineteen million, three hundred forty thousand, six hundred thirty-eight".