478990409 has 2 divisors, whose sum is σ = 478990410. Its totient is φ = 478990408.

The previous prime is 478990367. The next prime is 478990411. The reversal of 478990409 is 904099874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289102009 + 189888400 = 17003^2 + 13780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478990409 is a prime.

Together with 478990411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478990609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239495204 + 239495205.

It is an arithmetic number, because the mean of its divisors is an integer number (239495205).

Almost surely, 2^478990409 is an apocalyptic number.

It is an amenable number.

478990409 is a deficient number, since it is larger than the sum of its proper divisors (1).

478990409 is an equidigital number, since it uses as much as digits as its factorization.

478990409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 478990409 is about 21885.8495151548. The cubic root of 478990409 is about 782.4241963676.

The spelling of 478990409 in words is "four hundred seventy-eight million, nine hundred ninety thousand, four hundred nine".