189911808 has 108 divisors (see below), whose sum is σ = 552431880. Its totient is φ = 62742528.

The previous prime is 189911767. The next prime is 189911833. The reversal of 189911808 is 808119981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319960 + ... + 320552.

It is an arithmetic number, because the mean of its divisors is an integer number (5115110).

Almost surely, 2^189911808 is an apocalyptic number.

189911808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189911808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276215940).

189911808 is an abundant number, since it is smaller than the sum of its proper divisors (362520072).

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

189911808 is a wasteful number, since it uses less digits than its factorization.

189911808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 189911808 is about 13780.8493207059. The cubic root of 189911808 is about 574.8007455792.

The spelling of 189911808 in words is "one hundred eighty-nine million, nine hundred eleven thousand, eight hundred eight".