904809 has 8 divisors (see below), whose sum is σ = 1217920. Its totient is φ = 597456.

The previous prime is 904801. The next prime is 904811. The reversal of 904809 is 908409.

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

It is not a de Polignac number, because 904809 - 2³ = 904801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (904801) 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, 1057 + ... + 1710.

It is an arithmetic number, because the mean of its divisors is an integer number (152240).

2⁹⁰⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

904809 is a deficient number, since it is larger than the sum of its proper divisors (313111).

904809 is a wasteful number, since it uses less digits than its factorization.

904809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879.

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

The square root of 904809 is about 951.2144868535. The cubic root of 904809 is about 96.7205974659.

Subtracting 904809 from its reverse (908409), we obtain a square (3600 = 60²).

The spelling of 904809 in words is "nine hundred four thousand, eight hundred nine".