406181 has 4 divisors (see below), whose sum is σ = 430092. Its totient is φ = 382272.

The previous prime is 406177. The next prime is 406183. The reversal of 406181 is 181604.

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 348100 + 58081 = 590^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 406181 - 2² = 406177 is a prime.

It is a super-2 number, since 2×406181² = 329966009522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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 406181.

It is not an unprimeable number, because it can be changed into a prime (406183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11930 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (107523).

2⁴⁰⁶¹⁸¹ is an apocalyptic number.

It is an amenable number.

406181 is a deficient number, since it is larger than the sum of its proper divisors (23911).

406181 is a wasteful number, since it uses less digits than its factorization.

406181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23910.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 406181 is about 637.3233088472. The cubic root of 406181 is about 74.0582084014.

Adding to 406181 its reverse (181604), we get a palindrome (587785).

The spelling of 406181 in words is "four hundred six thousand, one hundred eighty-one".