405816317 has 2 divisors, whose sum is σ = 405816318. Its totient is φ = 405816316.

The previous prime is 405816311. The next prime is 405816353. The reversal of 405816317 is 713618504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402644356 + 3171961 = 20066^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 405816317 - 2¹⁸ = 405554173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405816311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202908158 + 202908159.

It is an arithmetic number, because the mean of its divisors is an integer number (202908159).

Almost surely, 2^405816317 is an apocalyptic number.

It is an amenable number.

405816317 is a deficient number, since it is larger than the sum of its proper divisors (1).

405816317 is an equidigital number, since it uses as much as digits as its factorization.

405816317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 405816317 is about 20144.8831468440. The cubic root of 405816317 is about 740.3603777922.

The spelling of 405816317 in words is "four hundred five million, eight hundred sixteen thousand, three hundred seventeen".