490809 has 16 divisors (see below), whose sum is σ = 725760. Its totient is φ = 292560.

The previous prime is 490783. The next prime is 490829. The reversal of 490809 is 908094.

It is not a de Polignac number, because 490809 - 2¹² = 486713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (490829) by changing a digit.

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, 3462 + ... + 3600.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁴⁹⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

490809 is a deficient number, since it is larger than the sum of its proper divisors (234951).

490809 is a wasteful number, since it uses less digits than its factorization.

490809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 490809 is about 700.5776188261. The cubic root of 490809 is about 78.8807151339.

The spelling of 490809 in words is "four hundred ninety thousand, eight hundred nine".