831704985 has 12 divisors (see below), whose sum is σ = 1441622052. Its totient is φ = 443575968.

The previous prime is 831704977. The next prime is 831704999. The reversal of 831704985 is 589407138.

It can be written as a sum of positive squares in 2 ways, for example, as 440496144 + 391208841 = 20988^2 + 19779^2 .

It is not a de Polignac number, because 831704985 - 2³ = 831704977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 18482333 = 831704985 / (8 + 3 + 1 + 7 + 0 + 4 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 831704985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9241122 + ... + 9241211.

It is an arithmetic number, because the mean of its divisors is an integer number (120135171).

Almost surely, 2^831704985 is an apocalyptic number.

It is an amenable number.

831704985 is a deficient number, since it is larger than the sum of its proper divisors (609917067).

831704985 is a wasteful number, since it uses less digits than its factorization.

831704985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18482344 (or 18482341 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 831704985 is about 28839.2958478532. The cubic root of 831704985 is about 940.4226954395.

The spelling of 831704985 in words is "eight hundred thirty-one million, seven hundred four thousand, nine hundred eighty-five".