999998477238389 has 2 divisors, whose sum is σ = 999998477238390. Its totient is φ = 999998477238388.

The previous prime is 999998477238379. The next prime is 999998477238511. The reversal of 999998477238389 is 983832774899999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743646900612100 + 256351576626289 = 27269890^2 + 16010983^2 .

It is a cyclic number.

It is not a de Polignac number, because 999998477238389 - 2⁴⁰ = 998898965610613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999998477238292 and 999998477238301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998477238349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999238619194 + 499999238619195.

It is an arithmetic number, because the mean of its divisors is an integer number (499999238619195).

Almost surely, 2^{999998477238389} is an apocalyptic number.

It is an amenable number.

999998477238389 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998477238389 is an equidigital number, since it uses as much as digits as its factorization.

999998477238389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 959961010176, while the sum is 104.

The spelling of 999998477238389 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, four hundred seventy-seven million, two hundred thirty-eight thousand, three hundred eighty-nine".