509139798 has 8 divisors (see below), whose sum is σ = 1018279608. Its totient is φ = 169713264.

The previous prime is 509139769. The next prime is 509139811. The reversal of 509139798 is 897931905.

It is a happy number.

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

509139798 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 509139798.

It is a congruent number.

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, 42428311 + ... + 42428322.

It is an arithmetic number, because the mean of its divisors is an integer number (127284951).

Almost surely, 2^509139798 is an apocalyptic number.

509139798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

509139798 is a wasteful number, since it uses less digits than its factorization.

509139798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84856638.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 509139798 is about 22564.1263513569. The cubic root of 509139798 is about 798.5075288522.

The spelling of 509139798 in words is "five hundred nine million, one hundred thirty-nine thousand, seven hundred ninety-eight".