609920 has 32 divisors (see below), whose sum is σ = 1459620. Its totient is φ = 243712.

The previous prime is 609913. The next prime is 609923. The reversal of 609920 is 29906.

It can be written as a sum of positive squares in 2 ways, for example, as 602176 + 7744 = 776^2 + 88^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 609920.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609920.

It is not an unprimeable number, because it can be changed into a prime (609923) by changing a digit.

609920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164 + ... + 1116.

2⁶⁰⁹⁹²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729810).

609920 is an abundant number, since it is smaller than the sum of its proper divisors (849700).

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

609920 is an equidigital number, since it uses as much as digits as its factorization.

609920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 609920 is about 780.9737511594. The cubic root of 609920 is about 84.8055532141.

The spelling of 609920 in words is "six hundred nine thousand, nine hundred twenty".