831985 has 16 divisors (see below), whose sum is σ = 1245312. Its totient is φ = 518400.

The previous prime is 831983. The next prime is 832003. The reversal of 831985 is 589138.

831985 = 270² + 271² + ... + 280².

It is not a de Polignac number, because 831985 - 2¹ = 831983 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 831985.

It is not an unprimeable number, because it can be changed into a prime (831983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696 + ... + 1465.

It is an arithmetic number, because the mean of its divisors is an integer number (77832).

2⁸³¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

831985 is a deficient number, since it is larger than the sum of its proper divisors (413327).

831985 is a wasteful number, since it uses less digits than its factorization.

831985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184.

The product of its digits is 8640, while the sum is 34.

The square root of 831985 is about 912.1321176233. The cubic root of 831985 is about 94.0528222807.

The spelling of 831985 in words is "eight hundred thirty-one thousand, nine hundred eighty-five".