506399 has 4 divisors (see below), whose sum is σ = 508200. Its totient is φ = 504600.

The previous prime is 506393. The next prime is 506417. The reversal of 506399 is 993605.

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 506399 - 2¹⁶ = 440863 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 (506393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (127050).

2⁵⁰⁶³⁹⁹ is an apocalyptic number.

506399 is a deficient number, since it is larger than the sum of its proper divisors (1801).

506399 is a wasteful number, since it uses less digits than its factorization.

506399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 506399 is about 711.6171723617. The cubic root of 506399 is about 79.7072109897.

The spelling of 506399 in words is "five hundred six thousand, three hundred ninety-nine".