398687503369 has 2 divisors, whose sum is σ = 398687503370. Its totient is φ = 398687503368.

The previous prime is 398687503363. The next prime is 398687503391. The reversal of 398687503369 is 963305786893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354248755344 + 44438748025 = 595188^2 + 210805^2 .

It is a cyclic number.

It is not a de Polignac number, because 398687503369 - 2²⁵ = 398653948937 is a prime.

It is a super-2 number, since 2×398687503369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398687503363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199343751684 + 199343751685.

It is an arithmetic number, because the mean of its divisors is an integer number (199343751685).

Almost surely, 2^398687503369 is an apocalyptic number.

It is an amenable number.

398687503369 is a deficient number, since it is larger than the sum of its proper divisors (1).

398687503369 is an equidigital number, since it uses as much as digits as its factorization.

398687503369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176359680, while the sum is 67.

The spelling of 398687503369 in words is "three hundred ninety-eight billion, six hundred eighty-seven million, five hundred three thousand, three hundred sixty-nine".