408181 has 4 divisors (see below), whose sum is σ = 425952. Its totient is φ = 390412.

The previous prime is 408173. The next prime is 408197. The reversal of 408181 is 181804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 408181 - 2³ = 408173 is a prime.

It is a super-2 number, since 2×408181² = 333223457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408131) 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 3 ways as a sum of consecutive naturals, for example, 8851 + ... + 8896.

It is an arithmetic number, because the mean of its divisors is an integer number (106488).

2⁴⁰⁸¹⁸¹ is an apocalyptic number.

It is an amenable number.

408181 is a deficient number, since it is larger than the sum of its proper divisors (17771).

408181 is a wasteful number, since it uses less digits than its factorization.

408181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17770.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 408181 is about 638.8904444426. The cubic root of 408181 is about 74.1795615055.

Adding to 408181 its reverse (181804), we get a palindrome (589985).

The spelling of 408181 in words is "four hundred eight thousand, one hundred eighty-one".