389905966 has 8 divisors (see below), whose sum is σ = 584984304. Its totient is φ = 194911200.

The previous prime is 389905933. The next prime is 389905979. The reversal of 389905966 is 669509983.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7515 + ... + 28918.

It is an arithmetic number, because the mean of its divisors is an integer number (73123038).

Almost surely, 2^389905966 is an apocalyptic number.

389905966 is a deficient number, since it is larger than the sum of its proper divisors (195078338).

389905966 is a wasteful number, since it uses less digits than its factorization.

389905966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41786.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 389905966 is about 19746.0367162628. The cubic root of 389905966 is about 730.5556325234. Note that the first 3 decimals are identical.

The spelling of 389905966 in words is "three hundred eighty-nine million, nine hundred five thousand, nine hundred sixty-six".