505849 has 4 divisors (see below), whose sum is σ = 507636. Its totient is φ = 504064.

The previous prime is 505823. The next prime is 505867. The reversal of 505849 is 948505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948505 = 5 ⋅189701.

It can be written as a sum of positive squares in 2 ways, for example, as 319225 + 186624 = 565^2 + 432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505849.

It is not an unprimeable number, because it can be changed into a prime (505819) 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, 364 + ... + 1069.

It is an arithmetic number, because the mean of its divisors is an integer number (126909).

2⁵⁰⁵⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

505849 is a deficient number, since it is larger than the sum of its proper divisors (1787).

505849 is a wasteful number, since it uses less digits than its factorization.

505849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 505849 is about 711.2306236376. The cubic root of 505849 is about 79.6783438666.

The spelling of 505849 in words is "five hundred five thousand, eight hundred forty-nine".