478342217 has 2 divisors, whose sum is σ = 478342218. Its totient is φ = 478342216.

The previous prime is 478342187. The next prime is 478342219. The reversal of 478342217 is 712243874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374383801 + 103958416 = 19349^2 + 10196^2 .

It is a cyclic number.

It is not a de Polignac number, because 478342217 - 2⁸ = 478341961 is a prime.

It is a super-2 number, since 2×478342217² = 457622553128950178, which contains 22 as substring.

Together with 478342219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478342219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239171108 + 239171109.

It is an arithmetic number, because the mean of its divisors is an integer number (239171109).

Almost surely, 2^478342217 is an apocalyptic number.

It is an amenable number.

478342217 is a deficient number, since it is larger than the sum of its proper divisors (1).

478342217 is an equidigital number, since it uses as much as digits as its factorization.

478342217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 38.

The square root of 478342217 is about 21871.0360294157. The cubic root of 478342217 is about 782.0710994937.

The spelling of 478342217 in words is "four hundred seventy-eight million, three hundred forty-two thousand, two hundred seventeen".