404242321 has 8 divisors (see below), whose sum is σ = 462157184. Its totient is φ = 346368960.

The previous prime is 404242313. The next prime is 404242351. The reversal of 404242321 is 123242404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404242321 - 2³ = 404242313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404242292 and 404242301.

It is not an unprimeable number, because it can be changed into a prime (404242301) 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 7 ways as a sum of consecutive naturals, for example, 14476 + ... + 31906.

It is an arithmetic number, because the mean of its divisors is an integer number (57769648).

Almost surely, 2^404242321 is an apocalyptic number.

It is an amenable number.

404242321 is a deficient number, since it is larger than the sum of its proper divisors (57914863).

404242321 is a wasteful number, since it uses less digits than its factorization.

404242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20751.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 404242321 is about 20105.7782987876. The cubic root of 404242321 is about 739.4019522804.

Adding to 404242321 its reverse (123242404), we get a palindrome (527484725).

The spelling of 404242321 in words is "four hundred four million, two hundred forty-two thousand, three hundred twenty-one".