404008121 has 4 divisors (see below), whose sum is σ = 440736144. Its totient is φ = 367280100.

The previous prime is 404008117. The next prime is 404008123. The reversal of 404008121 is 121800404.

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 404008121 - 2² = 404008117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404008093 and 404008102.

It is not an unprimeable number, because it can be changed into a prime (404008123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18363995 + ... + 18364016.

It is an arithmetic number, because the mean of its divisors is an integer number (110184036).

Almost surely, 2^404008121 is an apocalyptic number.

It is an amenable number.

404008121 is a deficient number, since it is larger than the sum of its proper divisors (36728023).

404008121 is a wasteful number, since it uses less digits than its factorization.

404008121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36728022.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 404008121 is about 20099.9532586521. The cubic root of 404008121 is about 739.2591325071.

Adding to 404008121 its reverse (121800404), we get a palindrome (525808525).

The spelling of 404008121 in words is "four hundred four million, eight thousand, one hundred twenty-one".