478819309 has 2 divisors, whose sum is σ = 478819310. Its totient is φ = 478819308.

The previous prime is 478819283. The next prime is 478819333. The reversal of 478819309 is 903918874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426546409 + 52272900 = 20653^2 + 7230^2 .

It is a cyclic number.

It is not a de Polignac number, because 478819309 - 2¹⁷ = 478688237 is a prime.

It is a super-3 number, since 3×478819309³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478819379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239409654 + 239409655.

It is an arithmetic number, because the mean of its divisors is an integer number (239409655).

Almost surely, 2^478819309 is an apocalyptic number.

It is an amenable number.

478819309 is a deficient number, since it is larger than the sum of its proper divisors (1).

478819309 is an equidigital number, since it uses as much as digits as its factorization.

478819309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 478819309 is about 21881.9402476106. The cubic root of 478819309 is about 782.3310221127.

The spelling of 478819309 in words is "four hundred seventy-eight million, eight hundred nineteen thousand, three hundred nine".