404091 has 12 divisors (see below), whose sum is σ = 594360. Its totient is φ = 264480.

The previous prime is 404081. The next prime is 404099. The reversal of 404091 is 190404.

It is not a de Polignac number, because 404091 - 2¹¹ = 402043 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (404099) 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 11 ways as a sum of consecutive naturals, for example, 151 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (49530).

2⁴⁰⁴⁰⁹¹ is an apocalyptic number.

404091 is a deficient number, since it is larger than the sum of its proper divisors (190269).

404091 is a wasteful number, since it uses less digits than its factorization.

404091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 404091 is about 635.6815240354. The cubic root of 404091 is about 73.9309680062.

Adding to 404091 its reverse (190404), we get a palindrome (594495).

The spelling of 404091 in words is "four hundred four thousand, ninety-one".