850005 has 24 divisors (see below), whose sum is σ = 1587768. Its totient is φ = 418176.

The previous prime is 849997. The next prime is 850009. The reversal of 850005 is 500058.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 695556 = 393^2 + 834^2 .

It is not a de Polignac number, because 850005 - 2³ = 849997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 850005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850009) 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 23 ways as a sum of consecutive naturals, for example, 142 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (66157).

2⁸⁵⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

850005 is a deficient number, since it is larger than the sum of its proper divisors (737763).

850005 is a wasteful number, since it uses less digits than its factorization.

850005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 850005 is about 921.9571573560. The cubic root of 850005 is about 94.7270094571.

The spelling of 850005 in words is "eight hundred fifty thousand, five".