609940 has 12 divisors (see below), whose sum is σ = 1280916. Its totient is φ = 243968.

The previous prime is 609929. The next prime is 609979. The reversal of 609940 is 49906.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 264196 = 588^2 + 514^2 .

It is a junction number, because it is equal to n+sod(n) for n = 609899 and 609908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15229 + ... + 15268.

It is an arithmetic number, because the mean of its divisors is an integer number (106743).

2⁶⁰⁹⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

609940 is an abundant number, since it is smaller than the sum of its proper divisors (670976).

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

609940 is a wasteful number, since it uses less digits than its factorization.

609940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30506 (or 30504 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 609940 is about 780.9865555821. The cubic root of 609940 is about 84.8064801622.

It can be divided in two parts, 60 and 9940, that added together give a 4-th power (10000 = 10⁴).

The spelling of 609940 in words is "six hundred nine thousand, nine hundred forty".