3993340781 has 2 divisors, whose sum is σ = 3993340782. Its totient is φ = 3993340780.

The previous prime is 3993340763. The next prime is 3993340811. The reversal of 3993340781 is 1870433993.

It is a happy number.

3993340781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2446885156 + 1546455625 = 49466^2 + 39325^2 .

It is a cyclic number.

It is not a de Polignac number, because 3993340781 - 2²² = 3989146477 is a prime.

It is a super-2 number, since 2×3993340781² = 31893541186395379922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3993340711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996670390 + 1996670391.

It is an arithmetic number, because the mean of its divisors is an integer number (1996670391).

Almost surely, 2^3993340781 is an apocalyptic number.

It is an amenable number.

3993340781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993340781 is an equidigital number, since it uses as much as digits as its factorization.

3993340781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 3993340781 is about 63192.8855251918. The cubic root of 3993340781 is about 1586.5196584005.

The spelling of 3993340781 in words is "three billion, nine hundred ninety-three million, three hundred forty thousand, seven hundred eighty-one".