388891009 has 8 divisors (see below), whose sum is σ = 424108160. Its totient is φ = 354431376.

The previous prime is 388890967. The next prime is 388891021. The reversal of 388891009 is 900198883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 388891009 - 2¹¹ = 388888961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 388891009.

It is not an unprimeable number, because it can be changed into a prime (388891039) 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 7 ways as a sum of consecutive naturals, for example, 188307 + ... + 190360.

It is an arithmetic number, because the mean of its divisors is an integer number (53013520).

Almost surely, 2^388891009 is an apocalyptic number.

It is an amenable number.

388891009 is a deficient number, since it is larger than the sum of its proper divisors (35217151).

388891009 is a wasteful number, since it uses less digits than its factorization.

388891009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378759.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 388891009 is about 19720.3196982199. The cubic root of 388891009 is about 729.9211830837.

The spelling of 388891009 in words is "three hundred eighty-eight million, eight hundred ninety-one thousand, nine".