504139687 has 4 divisors (see below), whose sum is σ = 504402696. Its totient is φ = 503876680.

The previous prime is 504139663. The next prime is 504139693. The reversal of 504139687 is 786931405.

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

It is a cyclic number.

It is not a de Polignac number, because 504139687 - 2¹¹ = 504137639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (504139627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128608 + ... + 132469.

It is an arithmetic number, because the mean of its divisors is an integer number (126100674).

Almost surely, 2^504139687 is an apocalyptic number.

504139687 is a deficient number, since it is larger than the sum of its proper divisors (263009).

504139687 is a wasteful number, since it uses less digits than its factorization.

504139687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263008.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 504139687 is about 22453.0551818678. The cubic root of 504139687 is about 795.8849562912.

The spelling of 504139687 in words is "five hundred four million, one hundred thirty-nine thousand, six hundred eighty-seven".