3943981336 has 8 divisors (see below), whose sum is σ = 7394965020. Its totient is φ = 1971990664.

The previous prime is 3943981303. The next prime is 3943981339. The reversal of 3943981336 is 6331893493.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 3943981336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943981339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246498826 + ... + 246498841.

Almost surely, 2^3943981336 is an apocalyptic number.

It is an amenable number.

3943981336 is a deficient number, since it is larger than the sum of its proper divisors (3450983684).

3943981336 is a wasteful number, since it uses less digits than its factorization.

3943981336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492997673 (or 492997669 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 49.

The square root of 3943981336 is about 62801.1252765426. The cubic root of 3943981336 is about 1579.9558466538.

The spelling of 3943981336 in words is "three billion, nine hundred forty-three million, nine hundred eighty-one thousand, three hundred thirty-six".