478326421 has 2 divisors, whose sum is σ = 478326422. Its totient is φ = 478326420.

The previous prime is 478326413. The next prime is 478326449. The reversal of 478326421 is 124623874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281232900 + 197093521 = 16770^2 + 14039^2 .

It is a cyclic number.

It is not a de Polignac number, because 478326421 - 2³ = 478326413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478326451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239163210 + 239163211.

It is an arithmetic number, because the mean of its divisors is an integer number (239163211).

Almost surely, 2^478326421 is an apocalyptic number.

It is an amenable number.

478326421 is a deficient number, since it is larger than the sum of its proper divisors (1).

478326421 is an equidigital number, since it uses as much as digits as its factorization.

478326421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 37.

The square root of 478326421 is about 21870.6749095678. The cubic root of 478326421 is about 782.0624907817.

The spelling of 478326421 in words is "four hundred seventy-eight million, three hundred twenty-six thousand, four hundred twenty-one".