6398945393 has 2 divisors, whose sum is σ = 6398945394. Its totient is φ = 6398945392.

The previous prime is 6398945351. The next prime is 6398945417. The reversal of 6398945393 is 3935498936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4156638784 + 2242306609 = 64472^2 + 47353^2 .

It is a cyclic number.

It is not a de Polignac number, because 6398945393 - 2¹⁶ = 6398879857 is a prime.

It is not a weakly prime, because it can be changed into another prime (6398945093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199472696 + 3199472697.

It is an arithmetic number, because the mean of its divisors is an integer number (3199472697).

Almost surely, 2^6398945393 is an apocalyptic number.

It is an amenable number.

6398945393 is a deficient number, since it is larger than the sum of its proper divisors (1).

6398945393 is an equidigital number, since it uses as much as digits as its factorization.

6398945393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 59.

The square root of 6398945393 is about 79993.4084346954. The cubic root of 6398945393 is about 1856.5335475915.

The spelling of 6398945393 in words is "six billion, three hundred ninety-eight million, nine hundred forty-five thousand, three hundred ninety-three".