398687503391 has 2 divisors, whose sum is σ = 398687503392. Its totient is φ = 398687503390.

The previous prime is 398687503369. The next prime is 398687503397. The reversal of 398687503391 is 193305786893.

It is a strong prime.

It is an emirp because it is prime and its reverse (193305786893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398687503391 - 2³⁸ = 123809596447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398687503397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199343751695 + 199343751696.

It is an arithmetic number, because the mean of its divisors is an integer number (199343751696).

Almost surely, 2^398687503391 is an apocalyptic number.

398687503391 is a deficient number, since it is larger than the sum of its proper divisors (1).

398687503391 is an equidigital number, since it uses as much as digits as its factorization.

398687503391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 398687503391 in words is "three hundred ninety-eight billion, six hundred eighty-seven million, five hundred three thousand, three hundred ninety-one".