860209 has 4 divisors (see below), whose sum is σ = 983104. Its totient is φ = 737316.

The previous prime is 860143. The next prime is 860239. The reversal of 860209 is 902068.

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 860209 - 2⁹ = 859697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (860239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61437 + ... + 61450.

It is an arithmetic number, because the mean of its divisors is an integer number (245776).

2⁸⁶⁰²⁰⁹ is an apocalyptic number.

It is an amenable number.

860209 is a deficient number, since it is larger than the sum of its proper divisors (122895).

860209 is a wasteful number, since it uses less digits than its factorization.

860209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122894.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 860209 is about 927.4745279521. The cubic root of 860209 is about 95.1045570890.

The spelling of 860209 in words is "eight hundred sixty thousand, two hundred nine".