388522009 has 4 divisors (see below), whose sum is σ = 388731316. Its totient is φ = 388312704.

The previous prime is 388522007. The next prime is 388522081. The reversal of 388522009 is 900225883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900225883 = 21023 ⋅42821.

It can be written as a sum of positive squares in 2 ways, for example, as 68112009 + 320410000 = 8253^2 + 17900^2 .

It is a cyclic number.

It is not a de Polignac number, because 388522009 - 2¹ = 388522007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388522007) 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, 101844 + ... + 105589.

It is an arithmetic number, because the mean of its divisors is an integer number (97182829).

Almost surely, 2^388522009 is an apocalyptic number.

It is an amenable number.

388522009 is a deficient number, since it is larger than the sum of its proper divisors (209307).

388522009 is a wasteful number, since it uses less digits than its factorization.

388522009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209306.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 388522009 is about 19710.9616457442. The cubic root of 388522009 is about 729.6902476430.

The spelling of 388522009 in words is "three hundred eighty-eight million, five hundred twenty-two thousand, nine".