609040 has 40 divisors (see below), whose sum is σ = 1482048. Its totient is φ = 232320.

The previous prime is 608999. The next prime is 609043. The reversal of 609040 is 40906.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 608999 and 609017.

It is not an unprimeable number, because it can be changed into a prime (609043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1675 + ... + 2005.

2⁶⁰⁹⁰⁴⁰ 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 609040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741024).

609040 is an abundant number, since it is smaller than the sum of its proper divisors (873008).

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

609040 is a wasteful number, since it uses less digits than its factorization.

609040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 609040 is about 780.4101485757. The cubic root of 609040 is about 84.7647474213.

Adding to 609040 its reverse (40906), we get a palindrome (649946).

The spelling of 609040 in words is "six hundred nine thousand, forty".