388018009 has 4 divisors (see below), whose sum is σ = 388201216. Its totient is φ = 387834804.

The previous prime is 388017991. The next prime is 388018021. The reversal of 388018009 is 900810883.

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.

It is a cyclic number.

It is not a de Polignac number, because 388018009 - 2⁵ = 388017977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388018039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88389 + ... + 92674.

It is an arithmetic number, because the mean of its divisors is an integer number (97050304).

Almost surely, 2^388018009 is an apocalyptic number.

It is an amenable number.

388018009 is a deficient number, since it is larger than the sum of its proper divisors (183207).

388018009 is a wasteful number, since it uses less digits than its factorization.

388018009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183206.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 388018009 is about 19698.1727325151. The cubic root of 388018009 is about 729.3745872557.

The spelling of 388018009 in words is "three hundred eighty-eight million, eighteen thousand, nine".