609905 has 8 divisors (see below), whose sum is σ = 736512. Its totient is φ = 484848.

The previous prime is 609887. The next prime is 609907. The reversal of 609905 is 509906.

609905 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 a cyclic number.

It is not a de Polignac number, because 609905 - 2¹² = 605809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (609907) 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, 842 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (92064).

2⁶⁰⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

609905 is a deficient number, since it is larger than the sum of its proper divisors (126607).

609905 is a wasteful number, since it uses less digits than its factorization.

609905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 609905 is about 780.9641477046. The cubic root of 609905 is about 84.8048579898.

Subtracting from 609905 its reverse (509906), we obtain a palindrome (99999).

The spelling of 609905 in words is "six hundred nine thousand, nine hundred five".