1389815647506 has 384 divisors, whose sum is σ = 3949063372800. Its totient is φ = 346097940480.

The previous prime is 1389815647459. The next prime is 1389815647511. The reversal of 1389815647506 is 6057465189831.

1389815647506 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 8 + 156 + 475 + 0 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1063362505 + ... + 1063363811.

It is an arithmetic number, because the mean of its divisors is an integer number (10284019200).

Almost surely, 2^{1389815647506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389815647506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1974531686400).

1389815647506 is an abundant number, since it is smaller than the sum of its proper divisors (2559247725294).

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

1389815647506 is a wasteful number, since it uses less digits than its factorization.

1389815647506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2651 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 1389815647506 in words is "one trillion, three hundred eighty-nine billion, eight hundred fifteen million, six hundred forty-seven thousand, five hundred six".