404401421 has 4 divisors (see below), whose sum is σ = 404593500. Its totient is φ = 404209344.

The previous prime is 404401367. The next prime is 404401427. The reversal of 404401421 is 124104404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72760900 + 331640521 = 8530^2 + 18211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404401421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404401393 and 404401402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404401427) 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, 92846 + ... + 97103.

It is an arithmetic number, because the mean of its divisors is an integer number (101148375).

Almost surely, 2^404401421 is an apocalyptic number.

It is an amenable number.

404401421 is a deficient number, since it is larger than the sum of its proper divisors (192079).

404401421 is a wasteful number, since it uses less digits than its factorization.

404401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192078.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 404401421 is about 20109.7344835778. The cubic root of 404401421 is about 739.4989431319.

Adding to 404401421 its reverse (124104404), we get a palindrome (528505825).

The spelling of 404401421 in words is "four hundred four million, four hundred one thousand, four hundred twenty-one".