384391687 has 4 divisors (see below), whose sum is σ = 393767136. Its totient is φ = 375016240.

The previous prime is 384391649. The next prime is 384391699. The reversal of 384391687 is 786193483.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384391687 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 384391687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384391627) 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, 4687663 + ... + 4687744.

It is an arithmetic number, because the mean of its divisors is an integer number (98441784).

Almost surely, 2^384391687 is an apocalyptic number.

384391687 is a deficient number, since it is larger than the sum of its proper divisors (9375449).

384391687 is an equidigital number, since it uses as much as digits as its factorization.

384391687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375448.

The product of its digits is 870912, while the sum is 49.

The square root of 384391687 is about 19605.9094917833. The cubic root of 384391687 is about 727.0952859710.

The spelling of 384391687 in words is "three hundred eighty-four million, three hundred ninety-one thousand, six hundred eighty-seven".