509660 has 24 divisors (see below), whose sum is σ = 1134000. Its totient is φ = 191744.

The previous prime is 509659. The next prime is 509681. The reversal of 509660 is 66905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410 + ... + 1089.

It is an arithmetic number, because the mean of its divisors is an integer number (47250).

2⁵⁰⁹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

509660 is an abundant number, since it is smaller than the sum of its proper divisors (624340).

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

509660 is a wasteful number, since it uses less digits than its factorization.

509660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 509660 is about 713.9047555522. The cubic root of 509660 is about 79.8779388582.

The spelling of 509660 in words is "five hundred nine thousand, six hundred sixty".