384327991 has 16 divisors (see below), whose sum is σ = 421237600. Its totient is φ = 349360128.

The previous prime is 384327967. The next prime is 384328031. The reversal of 384327991 is 199723483.

It is a cyclic number.

It is not a de Polignac number, because 384327991 - 2⁹ = 384327479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384327961) 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, 47575 + ... + 55063.

It is an arithmetic number, because the mean of its divisors is an integer number (26327350).

Almost surely, 2^384327991 is an apocalyptic number.

384327991 is a deficient number, since it is larger than the sum of its proper divisors (36909609).

384327991 is a wasteful number, since it uses less digits than its factorization.

384327991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7618.

The product of its digits is 326592, while the sum is 46.

The square root of 384327991 is about 19604.2850162917. The cubic root of 384327991 is about 727.0551224076.

The spelling of 384327991 in words is "three hundred eighty-four million, three hundred twenty-seven thousand, nine hundred ninety-one".