505939 has 4 divisors (see below), whose sum is σ = 578224. Its totient is φ = 433656.

The previous prime is 505927. The next prime is 505949. The reversal of 505939 is 939505.

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 505939 - 2⁵ = 505907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505939.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505919) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36132 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (144556).

2⁵⁰⁵⁹³⁹ is an apocalyptic number.

505939 is a deficient number, since it is larger than the sum of its proper divisors (72285).

505939 is an equidigital number, since it uses as much as digits as its factorization.

505939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72284.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 505939 is about 711.2938914401. The cubic root of 505939 is about 79.6830690090.

It can be divided in two parts, 505 and 939, that added together give a square (1444 = 38²).

The spelling of 505939 in words is "five hundred five thousand, nine hundred thirty-nine".