3965813993 has 2 divisors, whose sum is σ = 3965813994. Its totient is φ = 3965813992.

The previous prime is 3965813927. The next prime is 3965814029. The reversal of 3965813993 is 3993185693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3277906009 + 687907984 = 57253^2 + 26228^2 .

It is a cyclic number.

It is not a de Polignac number, because 3965813993 - 2²² = 3961619689 is a prime.

It is not a weakly prime, because it can be changed into another prime (3965813393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1982906996 + 1982906997.

It is an arithmetic number, because the mean of its divisors is an integer number (1982906997).

Almost surely, 2^3965813993 is an apocalyptic number.

It is an amenable number.

3965813993 is a deficient number, since it is larger than the sum of its proper divisors (1).

3965813993 is an equidigital number, since it uses as much as digits as its factorization.

3965813993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 56.

The square root of 3965813993 is about 62974.7091537547. The cubic root of 3965813993 is about 1582.8658653752.

The spelling of 3965813993 in words is "three billion, nine hundred sixty-five million, eight hundred thirteen thousand, nine hundred ninety-three".