6393937409 has 2 divisors, whose sum is σ = 6393937410. Its totient is φ = 6393937408.

The previous prime is 6393937393. The next prime is 6393937441. The reversal of 6393937409 is 9047393936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6388485184 + 5452225 = 79928^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 6393937409 - 2⁴ = 6393937393 is a prime.

It is not a weakly prime, because it can be changed into another prime (6393937499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196968704 + 3196968705.

It is an arithmetic number, because the mean of its divisors is an integer number (3196968705).

Almost surely, 2^6393937409 is an apocalyptic number.

It is an amenable number.

6393937409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6393937409 is an equidigital number, since it uses as much as digits as its factorization.

6393937409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 53.

The square root of 6393937409 is about 79962.0998286063. The cubic root of 6393937409 is about 1856.0490970937.

The spelling of 6393937409 in words is "six billion, three hundred ninety-three million, nine hundred thirty-seven thousand, four hundred nine".