388929989 has 8 divisors (see below), whose sum is σ = 445655040. Its totient is φ = 332495856.

The previous prime is 388929979. The next prime is 388929997. The reversal of 388929989 is 989929883.

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

It is not a de Polignac number, because 388929989 - 2¹⁶ = 388864453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388929929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69854 + ... + 75215.

It is an arithmetic number, because the mean of its divisors is an integer number (55706880).

Almost surely, 2^388929989 is an apocalyptic number.

It is an amenable number.

388929989 is a deficient number, since it is larger than the sum of its proper divisors (56725051).

388929989 is a wasteful number, since it uses less digits than its factorization.

388929989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145459.

The product of its digits is 20155392, while the sum is 65.

The square root of 388929989 is about 19721.3079941468. The cubic root of 388929989 is about 729.9455698455.

The spelling of 388929989 in words is "three hundred eighty-eight million, nine hundred twenty-nine thousand, nine hundred eighty-nine".