3973871686626 has 64 divisors (see below), whose sum is σ = 9119917900800. Its totient is φ = 1281299731200.

The previous prime is 3973871686567. The next prime is 3973871686679. The reversal of 3973871686626 is 6266861783793.

3973871686626 is a `hidden beast` number, since 3 + 9 + 7 + 387 + 168 + 66 + 26 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3068260 + ... + 4166768.

It is an arithmetic number, because the mean of its divisors is an integer number (142498717200).

Almost surely, 2^{3973871686626} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3973871686626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4559958950400).

3973871686626 is an abundant number, since it is smaller than the sum of its proper divisors (5146046214174).

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

3973871686626 is a wasteful number, since it uses less digits than its factorization.

3973871686626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100712 (or 1100706 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 72.

The spelling of 3973871686626 in words is "three trillion, nine hundred seventy-three billion, eight hundred seventy-one million, six hundred eighty-six thousand, six hundred twenty-six".