189911806 has 8 divisors (see below), whose sum is σ = 325563120. Its totient is φ = 81390768.

The previous prime is 189911767. The next prime is 189911833. The reversal of 189911806 is 608119981.

It is a happy number.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782551 + ... + 6782578.

It is an arithmetic number, because the mean of its divisors is an integer number (40695390).

Almost surely, 2^189911806 is an apocalyptic number.

189911806 is a deficient number, since it is larger than the sum of its proper divisors (135651314).

189911806 is a wasteful number, since it uses less digits than its factorization.

189911806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13565138.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 189911806 is about 13780.8492481414. The cubic root of 189911806 is about 574.8007435615.

The spelling of 189911806 in words is "one hundred eighty-nine million, nine hundred eleven thousand, eight hundred six".