405430943821 has 2 divisors, whose sum is σ = 405430943822. Its totient is φ = 405430943820.

The previous prime is 405430943809. The next prime is 405430943837. The reversal of 405430943821 is 128349034504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304488758025 + 100942185796 = 551805^2 + 317714^2 .

It is a cyclic number.

It is not a de Polignac number, because 405430943821 - 2¹³ = 405430935629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405430943881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202715471910 + 202715471911.

It is an arithmetic number, because the mean of its divisors is an integer number (202715471911).

Almost surely, 2^405430943821 is an apocalyptic number.

It is an amenable number.

405430943821 is a deficient number, since it is larger than the sum of its proper divisors (1).

405430943821 is an equidigital number, since it uses as much as digits as its factorization.

405430943821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 405430943821 in words is "four hundred five billion, four hundred thirty million, nine hundred forty-three thousand, eight hundred twenty-one".