389439647 has 4 divisors (see below), whose sum is σ = 391416696. Its totient is φ = 387462600.

The previous prime is 389439643. The next prime is 389439649. The reversal of 389439647 is 746934983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 389439647 - 2² = 389439643 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 (389439643) 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, 988229 + ... + 988622.

It is an arithmetic number, because the mean of its divisors is an integer number (97854174).

Almost surely, 2^389439647 is an apocalyptic number.

389439647 is a deficient number, since it is larger than the sum of its proper divisors (1977049).

389439647 is a wasteful number, since it uses less digits than its factorization.

389439647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977048.

The product of its digits is 3919104, while the sum is 53.

The square root of 389439647 is about 19734.2252698199. The cubic root of 389439647 is about 730.2642734915.

The spelling of 389439647 in words is "three hundred eighty-nine million, four hundred thirty-nine thousand, six hundred forty-seven".