398340235789 has 2 divisors, whose sum is σ = 398340235790. Its totient is φ = 398340235788.

The previous prime is 398340235763. The next prime is 398340235817. The reversal of 398340235789 is 987532043893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337425059689 + 60915176100 = 580883^2 + 246810^2 .

It is a cyclic number.

It is not a de Polignac number, because 398340235789 - 2²³ = 398331847181 is a prime.

It is a super-2 number, since 2×398340235789² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398340235289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199170117894 + 199170117895.

It is an arithmetic number, because the mean of its divisors is an integer number (199170117895).

Almost surely, 2^398340235789 is an apocalyptic number.

It is an amenable number.

398340235789 is a deficient number, since it is larger than the sum of its proper divisors (1).

398340235789 is an equidigital number, since it uses as much as digits as its factorization.

398340235789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 398340235789 in words is "three hundred ninety-eight billion, three hundred forty million, two hundred thirty-five thousand, seven hundred eighty-nine".