384685321 has 2 divisors, whose sum is σ = 384685322. Its totient is φ = 384685320.

The previous prime is 384685303. The next prime is 384685331. The reversal of 384685321 is 123586483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217267600 + 167417721 = 14740^2 + 12939^2 .

It is an emirp because it is prime and its reverse (123586483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384685321 is a prime.

It is not a weakly prime, because it can be changed into another prime (384685331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192342660 + 192342661.

It is an arithmetic number, because the mean of its divisors is an integer number (192342661).

Almost surely, 2^384685321 is an apocalyptic number.

It is an amenable number.

384685321 is a deficient number, since it is larger than the sum of its proper divisors (1).

384685321 is an equidigital number, since it uses as much as digits as its factorization.

384685321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 40.

The square root of 384685321 is about 19613.3964677207. The cubic root of 384685321 is about 727.2803797732.

The spelling of 384685321 in words is "three hundred eighty-four million, six hundred eighty-five thousand, three hundred twenty-one".