388784 has 30 divisors (see below), whose sum is σ = 839604. Its totient is φ = 172960.

The previous prime is 388781. The next prime is 388789. The reversal of 388784 is 487883.

It is not an unprimeable number, because it can be changed into a prime (388781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8249 + ... + 8295.

2³⁸⁸⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419802).

388784 is an abundant number, since it is smaller than the sum of its proper divisors (450820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388784 is a wasteful number, since it uses less digits than its factorization.

388784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 60 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 388784 is about 623.5254605868. The cubic root of 388784 is about 72.9854227476.

Subtracting 388784 from its reverse (487883), we obtain a palindrome (99099).

The spelling of 388784 in words is "three hundred eighty-eight thousand, seven hundred eighty-four".