850985 has 4 divisors (see below), whose sum is σ = 1021188. Its totient is φ = 680784.

The previous prime is 850979. The next prime is 851009. The reversal of 850985 is 589058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589058 = 2 ⋅294529.

It can be written as a sum of positive squares in 2 ways, for example, as 583696 + 267289 = 764^2 + 517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850985 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 850985.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 85094 + ... + 85103.

It is an arithmetic number, because the mean of its divisors is an integer number (255297).

2⁸⁵⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

850985 is a deficient number, since it is larger than the sum of its proper divisors (170203).

850985 is a wasteful number, since it uses less digits than its factorization.

850985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170202.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 850985 is about 922.4884823129. The cubic root of 850985 is about 94.7634001511.

The spelling of 850985 in words is "eight hundred fifty thousand, nine hundred eighty-five".