389216509 has 8 divisors (see below), whose sum is σ = 430417152. Its totient is φ = 348985440.

The previous prime is 389216461. The next prime is 389216549. The reversal of 389216509 is 905612983.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 389216509 - 2⁹ = 389215997 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389216549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241549 + ... + 243154.

It is an arithmetic number, because the mean of its divisors is an integer number (53802144).

Almost surely, 2^389216509 is an apocalyptic number.

It is an amenable number.

389216509 is a deficient number, since it is larger than the sum of its proper divisors (41200643).

389216509 is a wasteful number, since it uses less digits than its factorization.

389216509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484787.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 389216509 is about 19728.5708808317. The cubic root of 389216509 is about 730.1247731928.

The spelling of 389216509 in words is "three hundred eighty-nine million, two hundred sixteen thousand, five hundred nine".