389043506 has 32 divisors (see below), whose sum is σ = 638305920. Its totient is φ = 177206400.

The previous prime is 389043503. The next prime is 389043509. The reversal of 389043506 is 605340983.

It is an interprime number because it is at equal distance from previous prime (389043503) and next prime (389043509).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 389043506.

It is not an unprimeable number, because it can be changed into a prime (389043503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108860 + ... + 112376.

It is an arithmetic number, because the mean of its divisors is an integer number (19947060).

Almost surely, 2^389043506 is an apocalyptic number.

389043506 is a deficient number, since it is larger than the sum of its proper divisors (249262414).

389043506 is a wasteful number, since it uses less digits than its factorization.

389043506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3650.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 389043506 is about 19724.1858133612. The cubic root of 389043506 is about 730.0165793445.

The spelling of 389043506 in words is "three hundred eighty-nine million, forty-three thousand, five hundred six".