405316421 has 4 divisors (see below), whose sum is σ = 405715200. Its totient is φ = 404917644.

The previous prime is 405316411. The next prime is 405316453. The reversal of 405316421 is 124613504.

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 405316421 - 2⁶ = 405316357 is a prime.

It is a super-2 number, since 2×405316421² = 328562802264498482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405316411) 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, 197861 + ... + 199898.

It is an arithmetic number, because the mean of its divisors is an integer number (101428800).

Almost surely, 2^405316421 is an apocalyptic number.

It is an amenable number.

405316421 is a deficient number, since it is larger than the sum of its proper divisors (398779).

405316421 is a wasteful number, since it uses less digits than its factorization.

405316421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398778.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 405316421 is about 20132.4718055186. The cubic root of 405316421 is about 740.0562539412.

Adding to 405316421 its reverse (124613504), we get a palindrome (529929925).

The spelling of 405316421 in words is "four hundred five million, three hundred sixteen thousand, four hundred twenty-one".