505138763 has 4 divisors (see below), whose sum is σ = 518791200. Its totient is φ = 491486328.

The previous prime is 505138727. The next prime is 505138771. The reversal of 505138763 is 367831505.

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 505138763 - 2⁸ = 505138507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505138703) by changing a digit.

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, 6826163 + ... + 6826236.

It is an arithmetic number, because the mean of its divisors is an integer number (129697800).

Almost surely, 2^505138763 is an apocalyptic number.

505138763 is a deficient number, since it is larger than the sum of its proper divisors (13652437).

505138763 is a wasteful number, since it uses less digits than its factorization.

505138763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13652436.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 505138763 is about 22475.2922784110. The cubic root of 505138763 is about 796.4103562254.

The spelling of 505138763 in words is "five hundred five million, one hundred thirty-eight thousand, seven hundred sixty-three".