505399 has 2 divisors, whose sum is σ = 505400. Its totient is φ = 505398.

The previous prime is 505369. The next prime is 505409. The reversal of 505399 is 993505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505399 - 2⁵ = 505367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505319) 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 as a sum of consecutive naturals, namely, 252699 + 252700.

It is an arithmetic number, because the mean of its divisors is an integer number (252700).

2⁵⁰⁵³⁹⁹ is an apocalyptic number.

505399 is a deficient number, since it is larger than the sum of its proper divisors (1).

505399 is an equidigital number, since it uses as much as digits as its factorization.

505399 is an odious number, because the sum of its binary digits is odd.

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

The square root of 505399 is about 710.9142001676. The cubic root of 505399 is about 79.6547097438.

The spelling of 505399 in words is "five hundred five thousand, three hundred ninety-nine".