498809 has 4 divisors (see below), whose sum is σ = 505716. Its totient is φ = 491904.

The previous prime is 498803. The next prime is 498833. The reversal of 498809 is 908894.

498809 is nontrivially palindromic in base 8.

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 162409 + 336400 = 403^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 498809 - 2¹² = 494713 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498803) 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, 3344 + ... + 3489.

It is an arithmetic number, because the mean of its divisors is an integer number (126429).

2⁴⁹⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

498809 is a deficient number, since it is larger than the sum of its proper divisors (6907).

498809 is an equidigital number, since it uses as much as digits as its factorization.

498809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6906.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 498809 is about 706.2641149032. The cubic root of 498809 is about 79.3069826726.

The spelling of 498809 in words is "four hundred ninety-eight thousand, eight hundred nine".