405316321 has 4 divisors (see below), whose sum is σ = 409104432. Its totient is φ = 401528212.

The previous prime is 405316273. The next prime is 405316357. The reversal of 405316321 is 123613504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405316321 - 2¹⁹ = 404792033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405316621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1893895 + ... + 1894108.

It is an arithmetic number, because the mean of its divisors is an integer number (102276108).

Almost surely, 2^405316321 is an apocalyptic number.

It is an amenable number.

405316321 is a deficient number, since it is larger than the sum of its proper divisors (3788111).

405316321 is a wasteful number, since it uses less digits than its factorization.

405316321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788110.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 405316321 is about 20132.4693219684. The cubic root of 405316321 is about 740.0561930788.

Adding to 405316321 its reverse (123613504), we get a palindrome (528929825).

The spelling of 405316321 in words is "four hundred five million, three hundred sixteen thousand, three hundred twenty-one".