398831368491 has 24 divisors (see below), whose sum is σ = 579982012064. Its totient is φ = 264091622400.

The previous prime is 398831368471. The next prime is 398831368517. The reversal of 398831368491 is 194863138893.

398831368491 is a `hidden beast` number, since 3 + 9 + 8 + 8 + 3 + 136 + 8 + 491 = 666.

It is not a de Polignac number, because 398831368491 - 2¹¹ = 398831366443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398831368471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13816125 + ... + 13844961.

Almost surely, 2^398831368491 is an apocalyptic number.

398831368491 is a deficient number, since it is larger than the sum of its proper divisors (181150643573).

398831368491 is a wasteful number, since it uses less digits than its factorization.

398831368491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39171 (or 39168 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 398831368491 in words is "three hundred ninety-eight billion, eight hundred thirty-one million, three hundred sixty-eight thousand, four hundred ninety-one".