3971252139620 has 24 divisors (see below), whose sum is σ = 8339681112504. Its totient is φ = 1588491023616.

The previous prime is 3971252139601. The next prime is 3971252139623. The reversal of 3971252139620 is 269312521793.

It can be written as a sum of positive squares in 4 ways, for example, as 17962968676 + 3953289170944 = 134026^2 + 1988288^2 .

It is not an unprimeable number, because it can be changed into a prime (3971252139623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308222 + ... + 4345898.

It is an arithmetic number, because the mean of its divisors is an integer number (347486713021).

Almost surely, 2^{3971252139620} is an apocalyptic number.

It is an amenable number.

3971252139620 is an abundant number, since it is smaller than the sum of its proper divisors (4368428972884).

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

3971252139620 is a wasteful number, since it uses less digits than its factorization.

3971252139620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229039 (or 1229037 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 3971252139620 in words is "three trillion, nine hundred seventy-one billion, two hundred fifty-two million, one hundred thirty-nine thousand, six hundred twenty".