3943161640 has 32 divisors (see below), whose sum is σ = 9678670560. Its totient is φ = 1433876800.

The previous prime is 3943161631. The next prime is 3943161641. The reversal of 3943161640 is 461613493.

It is a self number, because there is not a number n which added to its sum of digits gives 3943161640.

It is not an unprimeable number, because it can be changed into a prime (3943161641) 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, 4480426 + ... + 4481305.

It is an arithmetic number, because the mean of its divisors is an integer number (302458455).

Almost surely, 2^3943161640 is an apocalyptic number.

It is an amenable number.

3943161640 is an abundant number, since it is smaller than the sum of its proper divisors (5735508920).

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

3943161640 is a wasteful number, since it uses less digits than its factorization.

3943161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961753 (or 8961749 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 3943161640 is about 62794.5988123182. The cubic root of 3943161640 is about 1579.8463825439.

The spelling of 3943161640 in words is "three billion, nine hundred forty-three million, one hundred sixty-one thousand, six hundred forty".