404065221 has 24 divisors (see below), whose sum is σ = 629526240. Its totient is φ = 229858272.

The previous prime is 404065199. The next prime is 404065223. The reversal of 404065221 is 122560404.

It is not a de Polignac number, because 404065221 - 2¹⁷ = 403934149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404065191 and 404065200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404065223) 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 23 ways as a sum of consecutive naturals, for example, 27315 + ... + 39423.

It is an arithmetic number, because the mean of its divisors is an integer number (26230260).

Almost surely, 2^404065221 is an apocalyptic number.

It is an amenable number.

404065221 is a deficient number, since it is larger than the sum of its proper divisors (225461019).

404065221 is a wasteful number, since it uses less digits than its factorization.

404065221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12353 (or 12346 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 404065221 is about 20101.3736097810. The cubic root of 404065221 is about 739.2939582988.

The spelling of 404065221 in words is "four hundred four million, sixty-five thousand, two hundred twenty-one".