408081 has 4 divisors (see below), whose sum is σ = 544112. Its totient is φ = 272052.

The previous prime is 408077. The next prime is 408091. The reversal of 408081 is 180804.

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 not a de Polignac number, because 408081 - 2² = 408077 is a prime.

It is a super-2 number, since 2×408081² = 333060205122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (408011) 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, 68011 + ... + 68016.

It is an arithmetic number, because the mean of its divisors is an integer number (136028).

2⁴⁰⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

408081 is a deficient number, since it is larger than the sum of its proper divisors (136031).

408081 is a wasteful number, since it uses less digits than its factorization.

408081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136030.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 408081 is about 638.8121789697. The cubic root of 408081 is about 74.1735032764.

Adding to 408081 its reverse (180804), we get a palindrome (588885).

The spelling of 408081 in words is "four hundred eight thousand, eighty-one".