509489138 has 4 divisors (see below), whose sum is σ = 764233710. Its totient is φ = 254744568.

The previous prime is 509489093. The next prime is 509489143. The reversal of 509489138 is 831984905.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 280663009 + 228826129 = 16753^2 + 15127^2 .

It is a junction number, because it is equal to n+sod(n) for n = 509489092 and 509489101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127372283 + ... + 127372286.

Almost surely, 2^509489138 is an apocalyptic number.

509489138 is a deficient number, since it is larger than the sum of its proper divisors (254744572).

509489138 is a wasteful number, since it uses less digits than its factorization.

509489138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254744571.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 509489138 is about 22571.8660726135. The cubic root of 509489138 is about 798.6901157998.

The spelling of 509489138 in words is "five hundred nine million, four hundred eighty-nine thousand, one hundred thirty-eight".