401585 has 4 divisors (see below), whose sum is σ = 481908. Its totient is φ = 321264.

The previous prime is 401567. The next prime is 401587. The reversal of 401585 is 585104.

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 78961 + 322624 = 281^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 401585 - 2⁸ = 401329 is a prime.

It is a super-2 number, since 2×401585² = 322541024450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 401585.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 401585.

It is not an unprimeable number, because it can be changed into a prime (401587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40154 + ... + 40163.

It is an arithmetic number, because the mean of its divisors is an integer number (120477).

2⁴⁰¹⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

401585 is a deficient number, since it is larger than the sum of its proper divisors (80323).

401585 is an equidigital number, since it uses as much as digits as its factorization.

401585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80322.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 401585 is about 633.7073457046. The cubic root of 401585 is about 73.7778215438. Note that the first 3 decimals are identical.

Adding to 401585 its reverse (585104), we get a palindrome (986689).

The spelling of 401585 in words is "four hundred one thousand, five hundred eighty-five".