499805 has 4 divisors (see below), whose sum is σ = 599772. Its totient is φ = 399840.

The previous prime is 499801. The next prime is 499819. The reversal of 499805 is 508994.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155236 + 344569 = 394^2 + 587^2 .

It is not a de Polignac number, because 499805 - 2² = 499801 is a prime.

It is a Duffinian number.

It is a Curzon 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 499805.

It is not an unprimeable number, because it can be changed into a prime (499801) 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, 49976 + ... + 49985.

It is an arithmetic number, because the mean of its divisors is an integer number (149943).

2⁴⁹⁹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

499805 is a deficient number, since it is larger than the sum of its proper divisors (99967).

499805 is an equidigital number, since it uses as much as digits as its factorization.

499805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99966.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 499805 is about 706.9688819177. The cubic root of 499805 is about 79.3597331499.

The spelling of 499805 in words is "four hundred ninety-nine thousand, eight hundred five".