506389 has 4 divisors (see below), whose sum is σ = 545356. Its totient is φ = 467424.

The previous prime is 506381. The next prime is 506393. The reversal of 506389 is 983605.

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

It can be written as a sum of positive squares in 2 ways, for example, as 321489 + 184900 = 567^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 506389 - 2³ = 506381 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 506389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506381) 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, 19464 + ... + 19489.

It is an arithmetic number, because the mean of its divisors is an integer number (136339).

2⁵⁰⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

506389 is a deficient number, since it is larger than the sum of its proper divisors (38967).

506389 is a wasteful number, since it uses less digits than its factorization.

506389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38966.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 506389 is about 711.6101460772. The cubic root of 506389 is about 79.7066863195.

The spelling of 506389 in words is "five hundred six thousand, three hundred eighty-nine".