497809 has 8 divisors (see below), whose sum is σ = 541800. Its totient is φ = 454656.

The previous prime is 497801. The next prime is 497813. The reversal of 497809 is 908794.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46225 + 451584 = 215^2 + 672^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 497809 - 2³ = 497801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (497801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1809 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (67725).

2⁴⁹⁷⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

497809 is a deficient number, since it is larger than the sum of its proper divisors (43991).

497809 is a wasteful number, since it uses less digits than its factorization.

497809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 497809 is about 705.5558092738. Note that the first 3 decimals coincide. The cubic root of 497809 is about 79.2539496550.

The spelling of 497809 in words is "four hundred ninety-seven thousand, eight hundred nine".