505806205 has 16 divisors (see below), whose sum is σ = 631281024. Its totient is φ = 388745280.

The previous prime is 505806181. The next prime is 505806211. The reversal of 505806205 is 502608505.

505806205 = 238² + 239² + ... + 1152².

It is not a de Polignac number, because 505806205 - 2⁵ = 505806173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6169 + ... + 32398.

It is an arithmetic number, because the mean of its divisors is an integer number (39455064).

Almost surely, 2^505806205 is an apocalyptic number.

It is an amenable number.

505806205 is a deficient number, since it is larger than the sum of its proper divisors (125474819).

505806205 is a wasteful number, since it uses less digits than its factorization.

505806205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38676.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 505806205 is about 22490.1357265802. The cubic root of 505806205 is about 796.7609686479.

The spelling of 505806205 in words is "five hundred five million, eight hundred six thousand, two hundred five".