398519999909 has 2 divisors, whose sum is σ = 398519999910. Its totient is φ = 398519999908.

The previous prime is 398519999887. The next prime is 398519999921. The reversal of 398519999909 is 909999915893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204030179809 + 194489820100 = 451697^2 + 441010^2 .

It is a cyclic number.

It is not a de Polignac number, because 398519999909 - 2⁸ = 398519999653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398519999309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199259999954 + 199259999955.

It is an arithmetic number, because the mean of its divisors is an integer number (199259999955).

Almost surely, 2^398519999909 is an apocalyptic number.

It is an amenable number.

398519999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

398519999909 is an equidigital number, since it uses as much as digits as its factorization.

398519999909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 573956280, while the sum is 80.

The spelling of 398519999909 in words is "three hundred ninety-eight billion, five hundred nineteen million, nine hundred ninety-nine thousand, nine hundred nine".