509676842 has 4 divisors (see below), whose sum is σ = 764515266. Its totient is φ = 254838420.

The previous prime is 509676841. The next prime is 509676851. The reversal of 509676842 is 248676905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248676905 = 5 ⋅49735381.

It can be written as a sum of positive squares in only one way, i.e., 329821921 + 179854921 = 18161^2 + 13411^2 .

It is not an unprimeable number, because it can be changed into a prime (509676841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127419209 + ... + 127419212.

Almost surely, 2^509676842 is an apocalyptic number.

509676842 is a deficient number, since it is larger than the sum of its proper divisors (254838424).

509676842 is a wasteful number, since it uses less digits than its factorization.

509676842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254838423.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 509676842 is about 22576.0236091301. The cubic root of 509676842 is about 798.7881871890.

The spelling of 509676842 in words is "five hundred nine million, six hundred seventy-six thousand, eight hundred forty-two".