509644 has 12 divisors (see below), whose sum is σ = 901264. Its totient is φ = 252144.

The previous prime is 509633. The next prime is 509647. The reversal of 509644 is 446905.

It is not an unprimeable number, because it can be changed into a prime (509647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207 + ... + 1030.

2⁵⁰⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

509644 is a deficient number, since it is larger than the sum of its proper divisors (391620).

509644 is a wasteful number, since it uses less digits than its factorization.

509644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 509644 is about 713.8935494876. The cubic root of 509644 is about 79.8771029673.

The spelling of 509644 in words is "five hundred nine thousand, six hundred forty-four".