609904 has 10 divisors (see below), whose sum is σ = 1181720. Its totient is φ = 304944.

The previous prime is 609887. The next prime is 609907. The reversal of 609904 is 409906.

It is an Ulam number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 19044 + ... + 19075.

It is an arithmetic number, because the mean of its divisors is an integer number (118172).

2⁶⁰⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

609904 is a deficient number, since it is larger than the sum of its proper divisors (571816).

609904 is a wasteful number, since it uses less digits than its factorization.

609904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38127 (or 38121 counting only the distinct ones).

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

The square root of 609904 is about 780.9635074701. The cubic root of 609904 is about 84.8048116411.

The spelling of 609904 in words is "six hundred nine thousand, nine hundred four".