855609 has 8 divisors (see below), whose sum is σ = 1145760. Its totient is φ = 567936.

The previous prime is 855607. The next prime is 855619. The reversal of 855609 is 906558.

855609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855609 - 2¹ = 855607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

855609 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 855609.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 855609.

It is not an unprimeable number, because it can be changed into a prime (855601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457 + ... + 1385.

It is an arithmetic number, because the mean of its divisors is an integer number (143220).

2⁸⁵⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

855609 is a deficient number, since it is larger than the sum of its proper divisors (290151).

855609 is a wasteful number, since it uses less digits than its factorization.

855609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 855609 is about 924.9913513109. The cubic root of 855609 is about 94.9347289414.

The spelling of 855609 in words is "eight hundred fifty-five thousand, six hundred nine".