9990389393 has 2 divisors, whose sum is σ = 9990389394. Its totient is φ = 9990389392.

The previous prime is 9990389317. The next prime is 9990389407. The reversal of 9990389393 is 3939830999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9538061569 + 452327824 = 97663^2 + 21268^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990389393 - 2²⁰ = 9989340817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9990089393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995194696 + 4995194697.

It is an arithmetic number, because the mean of its divisors is an integer number (4995194697).

Almost surely, 2^9990389393 is an apocalyptic number.

It is an amenable number.

9990389393 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990389393 is an equidigital number, since it uses as much as digits as its factorization.

9990389393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12754584, while the sum is 62.

The square root of 9990389393 is about 99951.9354139779. The cubic root of 9990389393 is about 2153.7442879748.

The spelling of 9990389393 in words is "nine billion, nine hundred ninety million, three hundred eighty-nine thousand, three hundred ninety-three".