398830850865 has 40 divisors (see below), whose sum is σ = 715386736680. Its totient is φ = 212577239808.

The previous prime is 398830850861. The next prime is 398830850867. The reversal of 398830850865 is 568058038893.

398830850865 is a `hidden beast` number, since 3 + 98 + 8 + 30 + 8 + 508 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 216236160144 + 182594690721 = 465012^2 + 427311^2 .

It is not a de Polignac number, because 398830850865 - 2² = 398830850861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398830850861) 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, 345627 + ... + 957663.

It is an arithmetic number, because the mean of its divisors is an integer number (17884668417).

Almost surely, 2^398830850865 is an apocalyptic number.

It is an amenable number.

398830850865 is a deficient number, since it is larger than the sum of its proper divisors (316555885815).

398830850865 is a wasteful number, since it uses less digits than its factorization.

398830850865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613663 (or 613654 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 398830850865 in words is "three hundred ninety-eight billion, eight hundred thirty million, eight hundred fifty thousand, eight hundred sixty-five".