490805 has 16 divisors (see below), whose sum is σ = 693120. Its totient is φ = 326592.

The previous prime is 490783. The next prime is 490829. The reversal of 490805 is 508094.

It is not a de Polignac number, because 490805 - 2⁶ = 490741 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1106 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (43320).

2⁴⁹⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

490805 is a deficient number, since it is larger than the sum of its proper divisors (202315).

490805 is a wasteful number, since it uses less digits than its factorization.

490805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 490805 is about 700.5747640331. The cubic root of 490805 is about 78.8805008458.

Adding to 490805 its reverse (508094), we get a palindrome (998899).

It can be divided in two parts, 4 and 90805, that added together give a palindrome (90809).

The spelling of 490805 in words is "four hundred ninety thousand, eight hundred five".