609855 has 16 divisors (see below), whose sum is σ = 987360. Its totient is φ = 321408.

The previous prime is 609821. The next prime is 609859. The reversal of 609855 is 558906.

It is not a de Polignac number, because 609855 - 2⁸ = 609599 is a prime.

609855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1449 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (61710).

2⁶⁰⁹⁸⁵⁵ is an apocalyptic number.

609855 is a deficient number, since it is larger than the sum of its proper divisors (377505).

609855 is a wasteful number, since it uses less digits than its factorization.

609855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

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

The square root of 609855 is about 780.9321353357. The cubic root of 609855 is about 84.8025404929.

The spelling of 609855 in words is "six hundred nine thousand, eight hundred fifty-five".