609820 has 12 divisors (see below), whose sum is σ = 1280664. Its totient is φ = 243920.

The previous prime is 609809. The next prime is 609821. The reversal of 609820 is 28906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609821) by changing a digit.

609820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15226 + ... + 15265.

It is an arithmetic number, because the mean of its divisors is an integer number (106722).

2⁶⁰⁹⁸²⁰ is an apocalyptic number.

It is an amenable number.

609820 is an abundant number, since it is smaller than the sum of its proper divisors (670844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

609820 is a wasteful number, since it uses less digits than its factorization.

609820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30500 (or 30498 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 609820 is about 780.9097258967. The cubic root of 609820 is about 84.8009181697.

The spelling of 609820 in words is "six hundred nine thousand, eight hundred twenty".