490009 has 4 divisors (see below), whose sum is σ = 527716. Its totient is φ = 452304.

The previous prime is 490003. The next prime is 490019. The reversal of 490009 is 900094.

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 73984 + 416025 = 272^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 490009 - 2³ = 490001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18834 + ... + 18859.

It is an arithmetic number, because the mean of its divisors is an integer number (131929).

2⁴⁹⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

490009 is a deficient number, since it is larger than the sum of its proper divisors (37707).

490009 is a wasteful number, since it uses less digits than its factorization.

490009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37706.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 490009 is about 700.0064285419. The cubic root of 490009 is about 78.8378343058.

The spelling of 490009 in words is "four hundred ninety thousand, nine".