478343917 has 2 divisors, whose sum is σ = 478343918. Its totient is φ = 478343916.

The previous prime is 478343851. The next prime is 478343923. The reversal of 478343917 is 719343874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404572996 + 73770921 = 20114^2 + 8589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478343917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478343927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239171958 + 239171959.

It is an arithmetic number, because the mean of its divisors is an integer number (239171959).

Almost surely, 2^478343917 is an apocalyptic number.

It is an amenable number.

478343917 is a deficient number, since it is larger than the sum of its proper divisors (1).

478343917 is an equidigital number, since it uses as much as digits as its factorization.

478343917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 478343917 is about 21871.0748935666. The cubic root of 478343917 is about 782.0720259707.

The spelling of 478343917 in words is "four hundred seventy-eight million, three hundred forty-three thousand, nine hundred seventeen".