461809 has 4 divisors (see below), whose sum is σ = 463216. Its totient is φ = 460404.

The previous prime is 461803. The next prime is 461819. The reversal of 461809 is 908164.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 461809 - 2³ = 461801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461801) 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, 82 + ... + 964.

It is an arithmetic number, because the mean of its divisors is an integer number (115804).

2⁴⁶¹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

461809 is a deficient number, since it is larger than the sum of its proper divisors (1407).

461809 is an equidigital number, since it uses as much as digits as its factorization.

461809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 461809 is about 679.5653022337. The cubic root of 461809 is about 77.2954857574.

The spelling of 461809 in words is "four hundred sixty-one thousand, eight hundred nine".