388209 has 4 divisors (see below), whose sum is σ = 517616. Its totient is φ = 258804.

The previous prime is 388187. The next prime is 388211. The reversal of 388209 is 902883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902883 = 3 ⋅300961.

It is not a de Polignac number, because 388209 - 2⁵ = 388177 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388259) 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, 64699 + ... + 64704.

It is an arithmetic number, because the mean of its divisors is an integer number (129404).

2³⁸⁸²⁰⁹ is an apocalyptic number.

It is an amenable number.

388209 is a deficient number, since it is larger than the sum of its proper divisors (129407).

388209 is a wasteful number, since it uses less digits than its factorization.

388209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129406.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 388209 is about 623.0642021493. The cubic root of 388209 is about 72.9494239032.

The spelling of 388209 in words is "three hundred eighty-eight thousand, two hundred nine".