505389 has 4 divisors (see below), whose sum is σ = 673856. Its totient is φ = 336924.

The previous prime is 505369. The next prime is 505399. The reversal of 505389 is 983505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 505389 - 2⁵ = 505357 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84229 + ... + 84234.

It is an arithmetic number, because the mean of its divisors is an integer number (168464).

2⁵⁰⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

505389 is a deficient number, since it is larger than the sum of its proper divisors (168467).

505389 is a wasteful number, since it uses less digits than its factorization.

505389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168466.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 505389 is about 710.9071669353. The cubic root of 505389 is about 79.6541843817.

The spelling of 505389 in words is "five hundred five thousand, three hundred eighty-nine".