1391688872640 has 1344 divisors, whose sum is σ = 5686965227520. Its totient is φ = 317399040000.

The previous prime is 1391688872621. The next prime is 1391688872683. The reversal of 1391688872640 is 462788861931.

1391688872640 is a `hidden beast` number, since 1 + 391 + 68 + 88 + 72 + 6 + 40 = 666.

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 191 ways as a sum of consecutive naturals, for example, 4952629300 + ... + 4952629580.

Almost surely, 2^{1391688872640} is an apocalyptic number.

1391688872640 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 1391688872640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843482613760).

1391688872640 is an abundant number, since it is smaller than the sum of its proper divisors (4295276354880).

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

1391688872640 is a wasteful number, since it uses less digits than its factorization.

1391688872640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 1391688872640 in words is "one trillion, three hundred ninety-one billion, six hundred eighty-eight million, eight hundred seventy-two thousand, six hundred forty".