404040321 has 6 divisors (see below), whose sum is σ = 583613810. Its totient is φ = 269360208.

The previous prime is 404040317. The next prime is 404040323. The reversal of 404040321 is 123040404.

It can be written as a sum of positive squares in only one way, i.e., 402564096 + 1476225 = 20064^2 + 1215^2 .

It is not a de Polignac number, because 404040321 - 2² = 404040317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404040294 and 404040303.

It is not an unprimeable number, because it can be changed into a prime (404040323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22446676 + ... + 22446693.

Almost surely, 2^404040321 is an apocalyptic number.

It is an amenable number.

404040321 is a deficient number, since it is larger than the sum of its proper divisors (179573489).

404040321 is a wasteful number, since it uses less digits than its factorization.

404040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44893375 (or 44893372 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 404040321 is about 20100.7542395802. The cubic root of 404040321 is about 739.2787719735.

Adding to 404040321 its reverse (123040404), we get a palindrome (527080725).

The spelling of 404040321 in words is "four hundred four million, forty thousand, three hundred twenty-one".