1381844394840 has 1024 divisors, whose sum is σ = 5785642598400. Its totient is φ = 255649996800.

The previous prime is 1381844394769. The next prime is 1381844394893. The reversal of 1381844394840 is 484934481831.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

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 255 ways as a sum of consecutive naturals, for example, 147928570 + ... + 147937910.

It is an arithmetic number, because the mean of its divisors is an integer number (5650041600).

Almost surely, 2^{1381844394840} is an apocalyptic number.

1381844394840 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 1381844394840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2892821299200).

1381844394840 is an abundant number, since it is smaller than the sum of its proper divisors (4403798203560).

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

1381844394840 is a wasteful number, since it uses less digits than its factorization.

1381844394840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9448 (or 9444 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 57.

The spelling of 1381844394840 in words is "one trillion, three hundred eighty-one billion, eight hundred forty-four million, three hundred ninety-four thousand, eight hundred forty".