858609 has 6 divisors (see below), whose sum is σ = 1240226. Its totient is φ = 572400.

The previous prime is 858589. The next prime is 858623. The reversal of 858609 is 906858.

It can be written as a sum of positive squares in only one way, i.e., 567009 + 291600 = 753^2 + 540^2 .

It is not a de Polignac number, because 858609 - 2⁵ = 858577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858709) 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 5 ways as a sum of consecutive naturals, for example, 47692 + ... + 47709.

2⁸⁵⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

858609 is a deficient number, since it is larger than the sum of its proper divisors (381617).

858609 is a wasteful number, since it uses less digits than its factorization.

858609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95407 (or 95404 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 858609 is about 926.6115691054. The cubic root of 858609 is about 95.0455552521.

The spelling of 858609 in words is "eight hundred fifty-eight thousand, six hundred nine".