388321 has 4 divisors (see below), whose sum is σ = 389572. Its totient is φ = 387072.

The previous prime is 388319. The next prime is 388351. The reversal of 388321 is 123883.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 291600 + 96721 = 540^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 388321 - 2¹ = 388319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388301) 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 3 ways as a sum of consecutive naturals, for example, 241 + ... + 913.

It is an arithmetic number, because the mean of its divisors is an integer number (97393).

2³⁸⁸³²¹ is an apocalyptic number.

It is an amenable number.

388321 is a deficient number, since it is larger than the sum of its proper divisors (1251).

388321 is an equidigital number, since it uses as much as digits as its factorization.

388321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its digits is 1152, while the sum is 25.

The square root of 388321 is about 623.1540740459. The cubic root of 388321 is about 72.9564386383.

The spelling of 388321 in words is "three hundred eighty-eight thousand, three hundred twenty-one".