384028321 has 2 divisors, whose sum is σ = 384028322. Its totient is φ = 384028320.

The previous prime is 384028319. The next prime is 384028331. The reversal of 384028321 is 123820483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282744225 + 101284096 = 16815^2 + 10064^2 .

It is a cyclic number.

It is not a de Polignac number, because 384028321 - 2¹ = 384028319 is a prime.

Together with 384028319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (384028331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192014160 + 192014161.

It is an arithmetic number, because the mean of its divisors is an integer number (192014161).

Almost surely, 2^384028321 is an apocalyptic number.

It is an amenable number.

384028321 is a deficient number, since it is larger than the sum of its proper divisors (1).

384028321 is an equidigital number, since it uses as much as digits as its factorization.

384028321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 384028321 is about 19596.6405539317. The cubic root of 384028321 is about 726.8661056770.

The spelling of 384028321 in words is "three hundred eighty-four million, twenty-eight thousand, three hundred twenty-one".