421585 has 4 divisors (see below), whose sum is σ = 505908. Its totient is φ = 337264.

The previous prime is 421559. The next prime is 421607. The reversal of 421585 is 585124.

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 126736 + 294849 = 356^2 + 543^2 .

It is a cyclic number.

It is not a de Polignac number, because 421585 - 2¹¹ = 419537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 42154 + ... + 42163.

It is an arithmetic number, because the mean of its divisors is an integer number (126477).

2⁴²¹⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

421585 is a deficient number, since it is larger than the sum of its proper divisors (84323).

421585 is an equidigital number, since it uses as much as digits as its factorization.

421585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84322.

The product of its digits is 1600, while the sum is 25.

The square root of 421585 is about 649.2957723565. The cubic root of 421585 is about 74.9828108756.

The spelling of 421585 in words is "four hundred twenty-one thousand, five hundred eighty-five".