1389078915840 has 1296 divisors, whose sum is σ = 6246832737600. Its totient is φ = 278629908480.

The previous prime is 1389078915793. The next prime is 1389078915841. The reversal of 1389078915840 is 485198709831.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389078915841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 282963306 + ... + 282968214.

Almost surely, 2^{1389078915840} is an apocalyptic number.

1389078915840 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 1389078915840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3123416368800).

1389078915840 is an abundant number, since it is smaller than the sum of its proper divisors (4857753821760).

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

1389078915840 is a wasteful number, since it uses less digits than its factorization.

1389078915840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994 (or 4966 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 1389078915840 in words is "one trillion, three hundred eighty-nine billion, seventy-eight million, nine hundred fifteen thousand, eight hundred forty".