478307813 has 2 divisors, whose sum is σ = 478307814. Its totient is φ = 478307812.

The previous prime is 478307789. The next prime is 478307827. The reversal of 478307813 is 318703874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282811489 + 195496324 = 16817^2 + 13982^2 .

It is a cyclic number.

It is not a de Polignac number, because 478307813 - 2²⁸ = 209872357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478307833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239153906 + 239153907.

It is an arithmetic number, because the mean of its divisors is an integer number (239153907).

Almost surely, 2^478307813 is an apocalyptic number.

It is an amenable number.

478307813 is a deficient number, since it is larger than the sum of its proper divisors (1).

478307813 is an equidigital number, since it uses as much as digits as its factorization.

478307813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 478307813 is about 21870.2494956048. The cubic root of 478307813 is about 782.0523493059.

The spelling of 478307813 in words is "four hundred seventy-eight million, three hundred seven thousand, eight hundred thirteen".