1389773385440 has 192 divisors, whose sum is σ = 3691189813248. Its totient is φ = 490089369600.

The previous prime is 1389773385439. The next prime is 1389773385449. The reversal of 1389773385440 is 445833779831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389773385449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11993057 + ... + 12108383.

It is an arithmetic number, because the mean of its divisors is an integer number (19224946944).

Almost surely, 2^{1389773385440} is an apocalyptic number.

1389773385440 is a gapful number since it is divisible by the number (10) 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 1389773385440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1845594906624).

1389773385440 is an abundant number, since it is smaller than the sum of its proper divisors (2301416427808).

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

1389773385440 is a wasteful number, since it uses less digits than its factorization.

1389773385440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115561 (or 115553 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 62.

It can be divided in two parts, 13897 and 73385440, that added together give a palindrome (73399337).

The spelling of 1389773385440 in words is "one trillion, three hundred eighty-nine billion, seven hundred seventy-three million, three hundred eighty-five thousand, four hundred forty".