999938005889 has 2 divisors, whose sum is σ = 999938005890. Its totient is φ = 999938005888.

The previous prime is 999938005867. The next prime is 999938005901. The reversal of 999938005889 is 988500839999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962753440000 + 37184565889 = 981200^2 + 192833^2 .

It is an emirp because it is prime and its reverse (988500839999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999938005889 - 2¹² = 999938001793 is a prime.

It is not a weakly prime, because it can be changed into another prime (999938005819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499969002944 + 499969002945.

It is an arithmetic number, because the mean of its divisors is an integer number (499969002945).

Almost surely, 2^999938005889 is an apocalyptic number.

It is an amenable number.

999938005889 is a deficient number, since it is larger than the sum of its proper divisors (1).

999938005889 is an equidigital number, since it uses as much as digits as its factorization.

999938005889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453496320, while the sum is 77.

The spelling of 999938005889 in words is "nine hundred ninety-nine billion, nine hundred thirty-eight million, five thousand, eight hundred eighty-nine".