388689 has 16 divisors (see below), whose sum is σ = 602112. Its totient is φ = 218448.

The previous prime is 388673. The next prime is 388691. The reversal of 388689 is 986883.

It is not a de Polignac number, because 388689 - 2⁴ = 388673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 388689.

It is not an unprimeable number, because it can be changed into a prime (388699) 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 15 ways as a sum of consecutive naturals, for example, 1632 + ... + 1854.

It is an arithmetic number, because the mean of its divisors is an integer number (37632).

2³⁸⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

388689 is a deficient number, since it is larger than the sum of its proper divisors (213423).

388689 is a wasteful number, since it uses less digits than its factorization.

388689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its digits is 82944, while the sum is 42.

The square root of 388689 is about 623.4492762046. The cubic root of 388689 is about 72.9794775613.

The spelling of 388689 in words is "three hundred eighty-eight thousand, six hundred eighty-nine".