404081 has 2 divisors, whose sum is σ = 404082. Its totient is φ = 404080.

The previous prime is 404051. The next prime is 404099. The reversal of 404081 is 180404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 13456 = 625^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 404081 - 2⁶ = 404017 is a prime.

It is a super-2 number, since 2×404081² = 326562909122, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (404011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202040 + 202041.

It is an arithmetic number, because the mean of its divisors is an integer number (202041).

2⁴⁰⁴⁰⁸¹ is an apocalyptic number.

It is an amenable number.

404081 is a deficient number, since it is larger than the sum of its proper divisors (1).

404081 is an equidigital number, since it uses as much as digits as its factorization.

404081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 404081 is about 635.6736584129. The cubic root of 404081 is about 73.9303581471.

Adding to 404081 its reverse (180404), we get a palindrome (584485).

The spelling of 404081 in words is "four hundred four thousand, eighty-one".