1391725891712 has 120 divisors (see below), whose sum is σ = 3008495071185. Its totient is φ = 641293965312.

The previous prime is 1391725891649. The next prime is 1391725891727. The reversal of 1391725891712 is 2171985271931.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 8 ways, for example, as 1349444662336 + 42281229376 = 1161656^2 + 205624^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=834184.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2255633228 + ... + 2255633844.

Almost surely, 2^{1391725891712} 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 1391725891712

1391725891712 is an abundant number, since it is smaller than the sum of its proper divisors (1616769179473).

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

1391725891712 is an frugal number, since it uses more digits than its factorization.

1391725891712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 632 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 56.

The spelling of 1391725891712 in words is "one trillion, three hundred ninety-one billion, seven hundred twenty-five million, eight hundred ninety-one thousand, seven hundred twelve".