384228809 has 2 divisors, whose sum is σ = 384228810. Its totient is φ = 384228808.

The previous prime is 384228797. The next prime is 384228841. The reversal of 384228809 is 908822483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235315600 + 148913209 = 15340^2 + 12203^2 .

It is a cyclic number.

It is not a de Polignac number, because 384228809 - 2⁸ = 384228553 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 384228809.

It is not a weakly prime, because it can be changed into another prime (384278809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192114404 + 192114405.

It is an arithmetic number, because the mean of its divisors is an integer number (192114405).

Almost surely, 2^384228809 is an apocalyptic number.

It is an amenable number.

384228809 is a deficient number, since it is larger than the sum of its proper divisors (1).

384228809 is an equidigital number, since it uses as much as digits as its factorization.

384228809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 384228809 is about 19601.7552530379. The cubic root of 384228809 is about 726.9925742830.

The spelling of 384228809 in words is "three hundred eighty-four million, two hundred twenty-eight thousand, eight hundred nine".