189986856 has 16 divisors (see below), whose sum is σ = 474967200. Its totient is φ = 63328944.

The previous prime is 189986851. The next prime is 189986869. The reversal of 189986856 is 658689981.

It is a self number, because there is not a number n which added to its sum of digits gives 189986856.

It is not an unprimeable number, because it can be changed into a prime (189986851) 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 3 ways as a sum of consecutive naturals, for example, 3958036 + ... + 3958083.

It is an arithmetic number, because the mean of its divisors is an integer number (29685450).

Almost surely, 2^189986856 is an apocalyptic number.

It is an amenable number.

189986856 is an abundant number, since it is smaller than the sum of its proper divisors (284980344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189986856 is a wasteful number, since it uses less digits than its factorization.

189986856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916128 (or 7916124 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 60.

The square root of 189986856 is about 13783.5719608525. The cubic root of 189986856 is about 574.8764508338.

The spelling of 189986856 in words is "one hundred eighty-nine million, nine hundred eighty-six thousand, eight hundred fifty-six".