478814309 has 2 divisors, whose sum is σ = 478814310. Its totient is φ = 478814308.

The previous prime is 478814263. The next prime is 478814311. The reversal of 478814309 is 903418874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 452753284 + 26061025 = 21278^2 + 5105^2 .

It is a cyclic number.

It is not a de Polignac number, because 478814309 - 2⁸ = 478814053 is a prime.

Together with 478814311, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 478814309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478814009) 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, 239407154 + 239407155.

It is an arithmetic number, because the mean of its divisors is an integer number (239407155).

Almost surely, 2^478814309 is an apocalyptic number.

It is an amenable number.

478814309 is a deficient number, since it is larger than the sum of its proper divisors (1).

478814309 is an equidigital number, since it uses as much as digits as its factorization.

478814309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 478814309 is about 21881.8259978458. The cubic root of 478814309 is about 782.3282989778.

The spelling of 478814309 in words is "four hundred seventy-eight million, eight hundred fourteen thousand, three hundred nine".