1378390111872 has 128 divisors (see below), whose sum is σ = 3837373954560. Its totient is φ = 437550001152.

The previous prime is 1378390111843. The next prime is 1378390111897. The reversal of 1378390111872 is 2781110938731.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1661103 + ... + 2348625.

It is an arithmetic number, because the mean of its divisors is an integer number (29979484020).

Almost surely, 2^{1378390111872} is an apocalyptic number.

1378390111872 is a gapful number since it is divisible by the number (12) 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 1378390111872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918686977280).

1378390111872 is an abundant number, since it is smaller than the sum of its proper divisors (2458983842688).

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

1378390111872 is a wasteful number, since it uses less digits than its factorization.

1378390111872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687790 (or 687778 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The spelling of 1378390111872 in words is "one trillion, three hundred seventy-eight billion, three hundred ninety million, one hundred eleven thousand, eight hundred seventy-two".