388009 has 2 divisors, whose sum is σ = 388010. Its totient is φ = 388008.

The previous prime is 387977. The next prime is 388051. The reversal of 388009 is 900883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230400 + 157609 = 480^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 388009 - 2⁵ = 387977 is a prime.

It is not a weakly prime, because it can be changed into another prime (388099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194004 + 194005.

It is an arithmetic number, because the mean of its divisors is an integer number (194005).

2³⁸⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

388009 is a deficient number, since it is larger than the sum of its proper divisors (1).

388009 is an equidigital number, since it uses as much as digits as its factorization.

388009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 388009 is about 622.9036843686. The cubic root of 388009 is about 72.9368942340.

It can be divided in two parts, 38800 and 9, that added together give a square (38809 = 197²).

The spelling of 388009 in words is "three hundred eighty-eight thousand, nine".