609885 has 12 divisors (see below), whose sum is σ = 1057212. Its totient is φ = 325248.

The previous prime is 609877. The next prime is 609887. The reversal of 609885 is 588906.

It can be written as a sum of positive squares in 2 ways, for example, as 352836 + 257049 = 594^2 + 507^2 .

It is not a de Polignac number, because 609885 - 2³ = 609877 is a prime.

609885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609887) 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 11 ways as a sum of consecutive naturals, for example, 6732 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (88101).

2⁶⁰⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

609885 is a deficient number, since it is larger than the sum of its proper divisors (447327).

609885 is a wasteful number, since it uses less digits than its factorization.

609885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13564 (or 13561 counting only the distinct ones).

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

The square root of 609885 is about 780.9513429145. The cubic root of 609885 is about 84.8039310062.

The spelling of 609885 in words is "six hundred nine thousand, eight hundred eighty-five".