852009 has 4 divisors (see below), whose sum is σ = 1136016. Its totient is φ = 568004.

The previous prime is 851971. The next prime is 852011. The reversal of 852009 is 900258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 852009 - 2⁷ = 851881 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 852009.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 852009.

It is not an unprimeable number, because it can be changed into a prime (852079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141999 + ... + 142004.

It is an arithmetic number, because the mean of its divisors is an integer number (284004).

2⁸⁵²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

852009 is a deficient number, since it is larger than the sum of its proper divisors (284007).

852009 is a wasteful number, since it uses less digits than its factorization.

852009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284006.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 852009 is about 923.0433359274. The cubic root of 852009 is about 94.8013948770.

The spelling of 852009 in words is "eight hundred fifty-two thousand, nine".