505138 has 16 divisors (see below), whose sum is σ = 816480. Its totient is φ = 233536.

The previous prime is 505129. The next prime is 505139. The reversal of 505138 is 831505.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 505138.

It is not an unprimeable number, because it can be changed into a prime (505139) by changing a digit.

505138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2733 + ... + 2911.

It is an arithmetic number, because the mean of its divisors is an integer number (51030).

2⁵⁰⁵¹³⁸ is an apocalyptic number.

505138 is a deficient number, since it is larger than the sum of its proper divisors (311342).

505138 is a wasteful number, since it uses less digits than its factorization.

505138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 505138 is about 710.7306100064. The cubic root of 505138 is about 79.6409955239.

The spelling of 505138 in words is "five hundred five thousand, one hundred thirty-eight".