1391988911472 has 480 divisors, whose sum is σ = 4352121446400. Its totient is φ = 413583667200.

The previous prime is 1391988911459. The next prime is 1391988911477. The reversal of 1391988911472 is 2741198891931.

1391988911472 is a `hidden beast` number, since 1 + 391 + 9 + 88 + 91 + 14 + 72 = 666.

It is a super-2 number, since 2×1391988911472² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391988911477) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 460464553 + ... + 460467575.

It is an arithmetic number, because the mean of its divisors is an integer number (9066919680).

Almost surely, 2^{1391988911472} is an apocalyptic number.

1391988911472 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 1391988911472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176060723200).

1391988911472 is an abundant number, since it is smaller than the sum of its proper divisors (2960132534928).

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

1391988911472 is a wasteful number, since it uses less digits than its factorization.

1391988911472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237 (or 3228 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 63.

The spelling of 1391988911472 in words is "one trillion, three hundred ninety-one billion, nine hundred eighty-eight million, nine hundred eleven thousand, four hundred seventy-two".