389647839 has 16 divisors (see below), whose sum is σ = 624999680. Its totient is φ = 210936960.

The previous prime is 389647823. The next prime is 389647849. The reversal of 389647839 is 938746983.

It is a happy number.

It is not a de Polignac number, because 389647839 - 2⁴ = 389647823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389647849) 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 15 ways as a sum of consecutive naturals, for example, 487882 + ... + 488679.

It is an arithmetic number, because the mean of its divisors is an integer number (39062480).

Almost surely, 2^389647839 is an apocalyptic number.

389647839 is a deficient number, since it is larger than the sum of its proper divisors (235351841).

389647839 is a wasteful number, since it uses less digits than its factorization.

389647839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976590.

The product of its digits is 7838208, while the sum is 57.

The square root of 389647839 is about 19739.4994617391. The cubic root of 389647839 is about 730.3943818806.

The spelling of 389647839 in words is "three hundred eighty-nine million, six hundred forty-seven thousand, eight hundred thirty-nine".