405818243 has 2 divisors, whose sum is σ = 405818244. Its totient is φ = 405818242.

The previous prime is 405818201. The next prime is 405818251. The reversal of 405818243 is 342818504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405818243 - 2¹⁴ = 405801859 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (405818293) 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 as a sum of consecutive naturals, namely, 202909121 + 202909122.

It is an arithmetic number, because the mean of its divisors is an integer number (202909122).

Almost surely, 2^405818243 is an apocalyptic number.

405818243 is a deficient number, since it is larger than the sum of its proper divisors (1).

405818243 is an equidigital number, since it uses as much as digits as its factorization.

405818243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 405818243 is about 20144.9309504898. The cubic root of 405818243 is about 740.3615490379.

The spelling of 405818243 in words is "four hundred five million, eight hundred eighteen thousand, two hundred forty-three".