509985870 has 16 divisors (see below), whose sum is σ = 1223966160. Its totient is φ = 135996224.

The previous prime is 509985863. The next prime is 509985871. The reversal of 509985870 is 78589905.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509985871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8499735 + ... + 8499794.

It is an arithmetic number, because the mean of its divisors is an integer number (76497885).

Almost surely, 2^509985870 is an apocalyptic number.

509985870 is an abundant number, since it is smaller than the sum of its proper divisors (713980290).

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

509985870 is a wasteful number, since it uses less digits than its factorization.

509985870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16999539.

The product of its (nonzero) digits is 907200, while the sum is 51.

The square root of 509985870 is about 22582.8667356472. The cubic root of 509985870 is about 798.9495953746.

The spelling of 509985870 in words is "five hundred nine million, nine hundred eighty-five thousand, eight hundred seventy".