9938394449 has 2 divisors, whose sum is σ = 9938394450. Its totient is φ = 9938394448.

The previous prime is 9938394407. The next prime is 9938394469. The reversal of 9938394449 is 9444938399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9644614849 + 293779600 = 98207^2 + 17140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9938394449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9938394391 and 9938394400.

It is not a weakly prime, because it can be changed into another prime (9938394469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969197224 + 4969197225.

It is an arithmetic number, because the mean of its divisors is an integer number (4969197225).

Almost surely, 2^9938394449 is an apocalyptic number.

It is an amenable number.

9938394449 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938394449 is an equidigital number, since it uses as much as digits as its factorization.

9938394449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30233088, while the sum is 62.

The square root of 9938394449 is about 99691.4963725593. The cubic root of 9938394449 is about 2150.0014024869.

The spelling of 9938394449 in words is "nine billion, nine hundred thirty-eight million, three hundred ninety-four thousand, four hundred forty-nine".