3981963997836 has 120 divisors (see below), whose sum is σ = 11357231849040. Its totient is φ = 1206521827200.

The previous prime is 3981963997769. The next prime is 3981963997883. The reversal of 3981963997836 is 6387993691893.

3981963997836 is a `hidden beast` number, since 3 + 9 + 8 + 196 + 399 + 7 + 8 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34802370 + ... + 34916598.

It is an arithmetic number, because the mean of its divisors is an integer number (94643598742).

Almost surely, 2^{3981963997836} is an apocalyptic number.

3981963997836 is a gapful number since it is divisible by the number (36) 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 3981963997836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5678615924520).

3981963997836 is an abundant number, since it is smaller than the sum of its proper divisors (7375267851204).

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

3981963997836 is a wasteful number, since it uses less digits than its factorization.

3981963997836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124037 (or 124026 counting only the distinct ones).

The product of its digits is 2857026816, while the sum is 81.

The spelling of 3981963997836 in words is "three trillion, nine hundred eighty-one billion, nine hundred sixty-three million, nine hundred ninety-seven thousand, eight hundred thirty-six".