189918908 has 24 divisors (see below), whose sum is σ = 351135120. Its totient is φ = 89631360.

The previous prime is 189918907. The next prime is 189918959. The reversal of 189918908 is 809819981.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 189918908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189918907) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16910 + ... + 25802.

It is an arithmetic number, because the mean of its divisors is an integer number (14630630).

Almost surely, 2^189918908 is an apocalyptic number.

It is an amenable number.

189918908 is a deficient number, since it is larger than the sum of its proper divisors (161216212).

189918908 is a wasteful number, since it uses less digits than its factorization.

189918908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197 (or 9195 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 189918908 is about 13781.1069221598. The cubic root of 189918908 is about 574.8079086136.

The spelling of 189918908 in words is "one hundred eighty-nine million, nine hundred eighteen thousand, nine hundred eight".