398044057517 has 2 divisors, whose sum is σ = 398044057518. Its totient is φ = 398044057516.

The previous prime is 398044057493. The next prime is 398044057589. The reversal of 398044057517 is 715750440893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325104092041 + 72939965476 = 570179^2 + 270074^2 .

It is a cyclic number.

It is not a de Polignac number, because 398044057517 - 2⁸ = 398044057261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398044054517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199022028758 + 199022028759.

It is an arithmetic number, because the mean of its divisors is an integer number (199022028759).

Almost surely, 2^398044057517 is an apocalyptic number.

It is an amenable number.

398044057517 is a deficient number, since it is larger than the sum of its proper divisors (1).

398044057517 is an equidigital number, since it uses as much as digits as its factorization.

398044057517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 398044057517 in words is "three hundred ninety-eight billion, forty-four million, fifty-seven thousand, five hundred seventeen".