494809 has 4 divisors (see below), whose sum is σ = 565504. Its totient is φ = 424116.

The previous prime is 494803. The next prime is 494843. The reversal of 494809 is 908494.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908494 = 2 ⋅454247.

It is not a de Polignac number, because 494809 - 2¹¹ = 492761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494803) 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, 35337 + ... + 35350.

It is an arithmetic number, because the mean of its divisors is an integer number (141376).

2⁴⁹⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

494809 is a deficient number, since it is larger than the sum of its proper divisors (70695).

494809 is an equidigital number, since it uses as much as digits as its factorization.

494809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70694.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 494809 is about 703.4266130877. The cubic root of 494809 is about 79.0944232295.

It can be divided in two parts, 49 and 4809, that multiplied together give a triangular number (235641 = T₆₈₆).

The spelling of 494809 in words is "four hundred ninety-four thousand, eight hundred nine".