3938813768 has 12 divisors (see below), whose sum is σ = 7385608665. Its totient is φ = 1969318128.

The previous prime is 3938813761. The next prime is 3938813777. The reversal of 3938813768 is 8673188393.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 3823938244 + 114875524 = 61838^2 + 10718^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=44378.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3938813761) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 166418 + ... + 188606.

Almost surely, 2^3938813768 is an apocalyptic number.

It is an amenable number.

3938813768 is a deficient number, since it is larger than the sum of its proper divisors (3446794897).

3938813768 is an frugal number, since it uses more digits than its factorization.

3938813768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44384 (or 22191 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 56.

The square root of 3938813768 is about 62759.9694709932. The cubic root of 3938813768 is about 1579.2655038241.

The spelling of 3938813768 in words is "three billion, nine hundred thirty-eight million, eight hundred thirteen thousand, seven hundred sixty-eight".