478393709 has 2 divisors, whose sum is σ = 478393710. Its totient is φ = 478393708.

The previous prime is 478393703. The next prime is 478393733. The reversal of 478393709 is 907393874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443228809 + 35164900 = 21053^2 + 5930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478393709 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 (478393703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239196854 + 239196855.

It is an arithmetic number, because the mean of its divisors is an integer number (239196855).

Almost surely, 2^478393709 is an apocalyptic number.

It is an amenable number.

478393709 is a deficient number, since it is larger than the sum of its proper divisors (1).

478393709 is an equidigital number, since it uses as much as digits as its factorization.

478393709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 478393709 is about 21872.2131710534. The cubic root of 478393709 is about 782.0991609656.

The spelling of 478393709 in words is "four hundred seventy-eight million, three hundred ninety-three thousand, seven hundred nine".