509898987 has 12 divisors (see below), whose sum is σ = 793176384. Its totient is φ = 313783920.

The previous prime is 509898979. The next prime is 509898997. The reversal of 509898987 is 789898905.

It is not a de Polignac number, because 509898987 - 2³ = 509898979 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (509898997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2178939 + ... + 2179172.

It is an arithmetic number, because the mean of its divisors is an integer number (66098032).

Almost surely, 2^509898987 is an apocalyptic number.

509898987 is a deficient number, since it is larger than the sum of its proper divisors (283277397).

509898987 is a wasteful number, since it uses less digits than its factorization.

509898987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358130 (or 4358127 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 63.

The square root of 509898987 is about 22580.9430051094. The cubic root of 509898987 is about 798.9042221698.

The spelling of 509898987 in words is "five hundred nine million, eight hundred ninety-eight thousand, nine hundred eighty-seven".