9938999773 has 2 divisors, whose sum is σ = 9938999774. Its totient is φ = 9938999772.

The previous prime is 9938999771. The next prime is 9938999813. The reversal of 9938999773 is 3779998399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9377404569 + 561595204 = 96837^2 + 23698^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938999773 - 2¹ = 9938999771 is a prime.

Together with 9938999771, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 9938999696 and 9938999705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9938999771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969499886 + 4969499887.

It is an arithmetic number, because the mean of its divisors is an integer number (4969499887).

Almost surely, 2^9938999773 is an apocalyptic number.

It is an amenable number.

9938999773 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938999773 is an equidigital number, since it uses as much as digits as its factorization.

9938999773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 208324872, while the sum is 73.

The square root of 9938999773 is about 99694.5323124593. The cubic root of 9938999773 is about 2150.0450520936.

The spelling of 9938999773 in words is "nine billion, nine hundred thirty-eight million, nine hundred ninety-nine thousand, seven hundred seventy-three".