384329991 has 4 divisors (see below), whose sum is σ = 512439992. Its totient is φ = 256219992.

The previous prime is 384329987. The next prime is 384329993. The reversal of 384329991 is 199923483.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 384329991 - 2² = 384329987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 384329991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384329993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64054996 + ... + 64055001.

It is an arithmetic number, because the mean of its divisors is an integer number (128109998).

Almost surely, 2^384329991 is an apocalyptic number.

384329991 is a deficient number, since it is larger than the sum of its proper divisors (128110001).

384329991 is a wasteful number, since it uses less digits than its factorization.

384329991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128110000.

The product of its digits is 419904, while the sum is 48.

The square root of 384329991 is about 19604.3360254817. The cubic root of 384329991 is about 727.0563835767.

The spelling of 384329991 in words is "three hundred eighty-four million, three hundred twenty-nine thousand, nine hundred ninety-one".