478391 has 2 divisors, whose sum is σ = 478392. Its totient is φ = 478390.

The previous prime is 478351. The next prime is 478399. The reversal of 478391 is 193874.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478391 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 478391.

It is not a weakly prime, because it can be changed into another prime (478399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239195 + 239196.

It is an arithmetic number, because the mean of its divisors is an integer number (239196).

2⁴⁷⁸³⁹¹ is an apocalyptic number.

478391 is a deficient number, since it is larger than the sum of its proper divisors (1).

478391 is an equidigital number, since it uses as much as digits as its factorization.

478391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 478391 is about 691.6581525580. The cubic root of 478391 is about 78.2097684699.

The spelling of 478391 in words is "four hundred seventy-eight thousand, three hundred ninety-one".