478039321 has 2 divisors, whose sum is σ = 478039322. Its totient is φ = 478039320.

The previous prime is 478039319. The next prime is 478039327. The reversal of 478039321 is 123930874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362369296 + 115670025 = 19036^2 + 10755^2 .

It is a cyclic number.

It is not a de Polignac number, because 478039321 - 2¹ = 478039319 is a prime.

Together with 478039319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (478039327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239019660 + 239019661.

It is an arithmetic number, because the mean of its divisors is an integer number (239019661).

Almost surely, 2^478039321 is an apocalyptic number.

It is an amenable number.

478039321 is a deficient number, since it is larger than the sum of its proper divisors (1).

478039321 is an equidigital number, since it uses as much as digits as its factorization.

478039321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 478039321 is about 21864.1103409217. The cubic root of 478039321 is about 781.9059902077.

The spelling of 478039321 in words is "four hundred seventy-eight million, thirty-nine thousand, three hundred twenty-one".