404311421 has 2 divisors, whose sum is σ = 404311422. Its totient is φ = 404311420.

The previous prime is 404311387. The next prime is 404311451. The reversal of 404311421 is 124113404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352312900 + 51998521 = 18770^2 + 7211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404311421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 404311393 and 404311402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404311451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202155710 + 202155711.

It is an arithmetic number, because the mean of its divisors is an integer number (202155711).

Almost surely, 2^404311421 is an apocalyptic number.

It is an amenable number.

404311421 is a deficient number, since it is larger than the sum of its proper divisors (1).

404311421 is an equidigital number, since it uses as much as digits as its factorization.

404311421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 404311421 is about 20107.4966368268. The cubic root of 404311421 is about 739.4440802825. Note that the first 3 decimals are identical.

Adding to 404311421 its reverse (124113404), we get a palindrome (528424825).

The spelling of 404311421 in words is "four hundred four million, three hundred eleven thousand, four hundred twenty-one".