389966643 has 48 divisors (see below), whose sum is σ = 654640896. Its totient is φ = 229897440.

The previous prime is 389966623. The next prime is 389966653. The reversal of 389966643 is 346669983.

It is a happy number.

It is not a de Polignac number, because 389966643 - 2⁵ = 389966611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389966643.

It is not an unprimeable number, because it can be changed into a prime (389966623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96930 + ... + 100872.

It is an arithmetic number, because the mean of its divisors is an integer number (13638352).

Almost surely, 2^389966643 is an apocalyptic number.

389966643 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

389966643 is a deficient number, since it is larger than the sum of its proper divisors (264674253).

389966643 is a wasteful number, since it uses less digits than its factorization.

389966643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006 (or 3994 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 54.

The square root of 389966643 is about 19747.5730913953. The cubic root of 389966643 is about 730.5935268097.

The spelling of 389966643 in words is "three hundred eighty-nine million, nine hundred sixty-six thousand, six hundred forty-three".