189986808 has 128 divisors (see below), whose sum is σ = 549918720. Its totient is φ = 54130560.

The previous prime is 189986803. The next prime is 189986809. The reversal of 189986808 is 808689981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189986803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406591 + ... + 407057.

It is an arithmetic number, because the mean of its divisors is an integer number (4296240).

Almost surely, 2^189986808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189986808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274959360).

189986808 is an abundant number, since it is smaller than the sum of its proper divisors (359931912).

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

189986808 is a wasteful number, since it uses less digits than its factorization.

189986808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 57.

The square root of 189986808 is about 13783.5702196492. The cubic root of 189986808 is about 574.8764024198.

The spelling of 189986808 in words is "one hundred eighty-nine million, nine hundred eighty-six thousand, eight hundred eight".