404181 has 6 divisors (see below), whose sum is σ = 583830. Its totient is φ = 269448.

The previous prime is 404177. The next prime is 404189. The reversal of 404181 is 181404.

It can be written as a sum of positive squares in only one way, i.e., 285156 + 119025 = 534^2 + 345^2 .

It is not a de Polignac number, because 404181 - 2² = 404177 is a prime.

It is a super-2 number, since 2×404181² = 326724561522, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 14.

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 404181.

It is not an unprimeable number, because it can be changed into a prime (404189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22446 + ... + 22463.

It is an arithmetic number, because the mean of its divisors is an integer number (97305).

2⁴⁰⁴¹⁸¹ is an apocalyptic number.

It is an amenable number.

404181 is a deficient number, since it is larger than the sum of its proper divisors (179649).

404181 is a wasteful number, since it uses less digits than its factorization.

404181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44915 (or 44912 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 404181 is about 635.7523102593. The cubic root of 404181 is about 73.9364562859.

Adding to 404181 its reverse (181404), we get a palindrome (585585).

It can be divided in two parts, 404 and 181, that added together give a palindrome (585).

The spelling of 404181 in words is "four hundred four thousand, one hundred eighty-one".