1391540649984 has 960 divisors, whose sum is σ = 4638423121920. Its totient is φ = 410234388480.

The previous prime is 1391540649977. The next prime is 1391540649997. The reversal of 1391540649984 is 4899460451931.

1391540649984 is a `hidden beast` number, since 1 + 3 + 9 + 1 + 540 + 6 + 4 + 9 + 9 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10957012929 + ... + 10957013055.

It is an arithmetic number, because the mean of its divisors is an integer number (4831690752).

Almost surely, 2^{1391540649984} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391540649984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2319211560960).

1391540649984 is an abundant number, since it is smaller than the sum of its proper divisors (3246882471936).

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

1391540649984 is a wasteful number, since it uses less digits than its factorization.

1391540649984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 1391540649984 in words is "one trillion, three hundred ninety-one billion, five hundred forty million, six hundred forty-nine thousand, nine hundred eighty-four".