398819785617 has 40 divisors (see below), whose sum is σ = 678186336960. Its totient is φ = 231199863840.

The previous prime is 398819785607. The next prime is 398819785667. The reversal of 398819785617 is 716587918893.

It is not a de Polignac number, because 398819785617 - 2⁴ = 398819785601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398819785607) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9710142 + ... + 9751127.

It is an arithmetic number, because the mean of its divisors is an integer number (16954658424).

Almost surely, 2^398819785617 is an apocalyptic number.

It is an amenable number.

398819785617 is a deficient number, since it is larger than the sum of its proper divisors (279366551343).

398819785617 is a wasteful number, since it uses less digits than its factorization.

398819785617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19461315 (or 19461306 counting only the distinct ones).

The product of its digits is 182891520, while the sum is 72.

The spelling of 398819785617 in words is "three hundred ninety-eight billion, eight hundred nineteen million, seven hundred eighty-five thousand, six hundred seventeen".