471809 has 4 divisors (see below), whose sum is σ = 508116. Its totient is φ = 435504.

The previous prime is 471803. The next prime is 471817. The reversal of 471809 is 908174.

471809 = 122² + 123² + ... + 147².

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 29584 + 442225 = 172^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 471809 - 2⁸ = 471553 is a prime.

It is a super-3 number, since 3×471809³ = 315079333254384387, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (471803) 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, 18134 + ... + 18159.

It is an arithmetic number, because the mean of its divisors is an integer number (127029).

2⁴⁷¹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

471809 is a deficient number, since it is larger than the sum of its proper divisors (36307).

471809 is a wasteful number, since it uses less digits than its factorization.

471809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36306.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 471809 is about 686.8835418031. The cubic root of 471809 is about 77.8494246079.

The spelling of 471809 in words is "four hundred seventy-one thousand, eight hundred nine".