3943496187821 has 8 divisors (see below), whose sum is σ = 3944911850880. Its totient is φ = 3942080690688.

The previous prime is 3943496187731. The next prime is 3943496187863. The reversal of 3943496187821 is 1287816943493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3943496187821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943496147821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64916300 + ... + 64977018.

It is an arithmetic number, because the mean of its divisors is an integer number (493113981360).

Almost surely, 2^{3943496187821} is an apocalyptic number.

It is an amenable number.

3943496187821 is a deficient number, since it is larger than the sum of its proper divisors (1415663059).

3943496187821 is a wasteful number, since it uses less digits than its factorization.

3943496187821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82963.

The product of its digits is 62705664, while the sum is 65.

The spelling of 3943496187821 in words is "three trillion, nine hundred forty-three billion, four hundred ninety-six million, one hundred eighty-seven thousand, eight hundred twenty-one".