404612121 has 16 divisors (see below), whose sum is σ = 571891968. Its totient is φ = 253574400.

The previous prime is 404612111. The next prime is 404612171. The reversal of 404612121 is 121216404.

It is a happy number.

It is not a de Polignac number, because 404612121 - 2²² = 400417817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404612111) 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 15 ways as a sum of consecutive naturals, for example, 43776 + ... + 52206.

It is an arithmetic number, because the mean of its divisors is an integer number (35743248).

Almost surely, 2^404612121 is an apocalyptic number.

It is an amenable number.

404612121 is a deficient number, since it is larger than the sum of its proper divisors (167279847).

404612121 is a wasteful number, since it uses less digits than its factorization.

404612121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9392.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 404612121 is about 20114.9725577740. The cubic root of 404612121 is about 739.6273513312.

Adding to 404612121 its reverse (121216404), we get a palindrome (525828525).

The spelling of 404612121 in words is "four hundred four million, six hundred twelve thousand, one hundred twenty-one".