475389809 has 4 divisors (see below), whose sum is σ = 475437300. Its totient is φ = 475342320.

The previous prime is 475389799. The next prime is 475389841. The reversal of 475389809 is 908983574.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 255520225 + 219869584 = 15985^2 + 14828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475389809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (475385809) 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, 2234 + ... + 30915.

It is an arithmetic number, because the mean of its divisors is an integer number (118859325).

Almost surely, 2^475389809 is an apocalyptic number.

It is an amenable number.

475389809 is a deficient number, since it is larger than the sum of its proper divisors (47491).

475389809 is a wasteful number, since it uses less digits than its factorization.

475389809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47490.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 475389809 is about 21803.4357155014. The cubic root of 475389809 is about 780.4587532543.

The spelling of 475389809 in words is "four hundred seventy-five million, three hundred eighty-nine thousand, eight hundred nine".