478609409 has 2 divisors, whose sum is σ = 478609410. Its totient is φ = 478609408.

The previous prime is 478609399. The next prime is 478609421. The reversal of 478609409 is 904906874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308880625 + 169728784 = 17575^2 + 13028^2 .

It is a cyclic number.

It is not a de Polignac number, because 478609409 - 2²⁰ = 477560833 is a prime.

It is not a weakly prime, because it can be changed into another prime (478609429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239304704 + 239304705.

It is an arithmetic number, because the mean of its divisors is an integer number (239304705).

It is a Proth number, since it is equal to 7303 ⋅ 2¹⁶ + 1 and 7303 < 2¹⁶.

Almost surely, 2^478609409 is an apocalyptic number.

It is an amenable number.

478609409 is a deficient number, since it is larger than the sum of its proper divisors (1).

478609409 is an equidigital number, since it uses as much as digits as its factorization.

478609409 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 47.

The square root of 478609409 is about 21877.1435292636. The cubic root of 478609409 is about 782.2166885987.

The spelling of 478609409 in words is "four hundred seventy-eight million, six hundred nine thousand, four hundred nine".