384678891 has 6 divisors (see below), whose sum is σ = 555647300. Its totient is φ = 256452588.

The previous prime is 384678869. The next prime is 384678893. The reversal of 384678891 is 198876483.

It is not a de Polignac number, because 384678891 - 2¹⁵ = 384646123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384678893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21371041 + ... + 21371058.

Almost surely, 2^384678891 is an apocalyptic number.

384678891 is a deficient number, since it is larger than the sum of its proper divisors (170968409).

384678891 is a wasteful number, since it uses less digits than its factorization.

384678891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42742105 (or 42742102 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 384678891 is about 19613.2325484607. The cubic root of 384678891 is about 727.2763275963.

The spelling of 384678891 in words is "three hundred eighty-four million, six hundred seventy-eight thousand, eight hundred ninety-one".