9938999849 has 2 divisors, whose sum is σ = 9938999850. Its totient is φ = 9938999848.

The previous prime is 9938999813. The next prime is 9938999879. The reversal of 9938999849 is 9489998399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6659376025 + 3279623824 = 81605^2 + 57268^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938999849 - 2⁸ = 9938999593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9938999849.

It is not a weakly prime, because it can be changed into another prime (9938999879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969499924 + 4969499925.

It is an arithmetic number, because the mean of its divisors is an integer number (4969499925).

Almost surely, 2^9938999849 is an apocalyptic number.

It is an amenable number.

9938999849 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938999849 is an equidigital number, since it uses as much as digits as its factorization.

9938999849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408146688, while the sum is 77.

The square root of 9938999849 is about 99694.5326936237. The cubic root of 9938999849 is about 2150.0450575738.

The spelling of 9938999849 in words is "nine billion, nine hundred thirty-eight million, nine hundred ninety-nine thousand, eight hundred forty-nine".