509198842 has 8 divisors (see below), whose sum is σ = 776319732. Its totient is φ = 250425600.

The previous prime is 509198831. The next prime is 509198857. The reversal of 509198842 is 248891905.

It can be written as a sum of positive squares in 2 ways, for example, as 452030121 + 57168721 = 21261^2 + 7561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 509198792 and 509198801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086759 + ... + 2087002.

Almost surely, 2^509198842 is an apocalyptic number.

509198842 is a deficient number, since it is larger than the sum of its proper divisors (267120890).

509198842 is a wasteful number, since it uses less digits than its factorization.

509198842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173824.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 509198842 is about 22565.4346734115. The cubic root of 509198842 is about 798.5383948057.

The spelling of 509198842 in words is "five hundred nine million, one hundred ninety-eight thousand, eight hundred forty-two".