388404 has 18 divisors (see below), whose sum is σ = 981890. Its totient is φ = 129456.

The previous prime is 388403. The next prime is 388459. The reversal of 388404 is 404883.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 63504 = 570^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388403) 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, 5359 + ... + 5430.

2³⁸⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

388404 is an abundant number, since it is smaller than the sum of its proper divisors (593486).

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

388404 is a wasteful number, since it uses less digits than its factorization.

388404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10799 (or 10794 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 388404 is about 623.2206671798. The cubic root of 388404 is about 72.9616361879.

The spelling of 388404 in words is "three hundred eighty-eight thousand, four hundred four".