384221905 has 16 divisors (see below), whose sum is σ = 478393344. Its totient is φ = 295928640.

The previous prime is 384221869. The next prime is 384221909. The reversal of 384221905 is 509122483.

It is a de Polignac number, because none of the positive numbers 2^k-384221905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384221909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24244 + ... + 36826.

It is an arithmetic number, because the mean of its divisors is an integer number (29899584).

Almost surely, 2^384221905 is an apocalyptic number.

It is an amenable number.

384221905 is a deficient number, since it is larger than the sum of its proper divisors (94171439).

384221905 is a wasteful number, since it uses less digits than its factorization.

384221905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12816.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 384221905 is about 19601.5791455689. The cubic root of 384221905 is about 726.9882199446.

The spelling of 384221905 in words is "three hundred eighty-four million, two hundred twenty-one thousand, nine hundred five".