609909 has 8 divisors (see below), whose sum is σ = 861120. Its totient is φ = 382656.

The previous prime is 609907. The next prime is 609911. The reversal of 609909 is 909906.

It is an interprime number because it is at equal distance from previous prime (609907) and next prime (609911).

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

It is not a de Polignac number, because 609909 - 2¹ = 609907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 609909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609907) 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 7 ways as a sum of consecutive naturals, for example, 5929 + ... + 6030.

It is an arithmetic number, because the mean of its divisors is an integer number (107640).

2⁶⁰⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

609909 is a deficient number, since it is larger than the sum of its proper divisors (251211).

609909 is a wasteful number, since it uses less digits than its factorization.

609909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11979.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 609909 is about 780.9667086374. The cubic root of 609909 is about 84.8050433840.

The spelling of 609909 in words is "six hundred nine thousand, nine hundred nine".