189968918 has 8 divisors (see below), whose sum is σ = 285129120. Its totient is φ = 94925880.

The previous prime is 189968893. The next prime is 189968921. The reversal of 189968918 is 819869981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 25118 + ... + 31793.

It is an arithmetic number, because the mean of its divisors is an integer number (35641140).

Almost surely, 2^189968918 is an apocalyptic number.

189968918 is a deficient number, since it is larger than the sum of its proper divisors (95160202).

189968918 is a wasteful number, since it uses less digits than its factorization.

189968918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58582.

The product of its digits is 2239488, while the sum is 59.

The square root of 189968918 is about 13782.9212433359. The cubic root of 189968918 is about 574.8583575500.

The spelling of 189968918 in words is "one hundred eighty-nine million, nine hundred sixty-eight thousand, nine hundred eighteen".