515805 has 16 divisors (see below), whose sum is σ = 834624. Its totient is φ = 272000.

The previous prime is 515803. The next prime is 515813. The reversal of 515805 is 508515.

It is not a de Polignac number, because 515805 - 2¹ = 515803 is a prime.

515805 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 515805.

It is not an unprimeable number, because it can be changed into a prime (515803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1930 + ... + 2180.

It is an arithmetic number, because the mean of its divisors is an integer number (52164).

2⁵¹⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

515805 is a deficient number, since it is larger than the sum of its proper divisors (318819).

515805 is a wasteful number, since it uses less digits than its factorization.

515805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 515805 is about 718.1956557930. The cubic root of 515805 is about 80.1976881733.

The spelling of 515805 in words is "five hundred fifteen thousand, eight hundred five".