189748907 has 4 divisors (see below), whose sum is σ = 190885296. Its totient is φ = 188612520.

The previous prime is 189748847. The next prime is 189748921. The reversal of 189748907 is 709847981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189748907 - 2⁸ = 189748651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189748007) 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 3 ways as a sum of consecutive naturals, for example, 567944 + ... + 568277.

It is an arithmetic number, because the mean of its divisors is an integer number (47721324).

Almost surely, 2^189748907 is an apocalyptic number.

189748907 is a deficient number, since it is larger than the sum of its proper divisors (1136389).

189748907 is a wasteful number, since it uses less digits than its factorization.

189748907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136388.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 189748907 is about 13774.9376405122. The cubic root of 189748907 is about 574.6363492687.

The spelling of 189748907 in words is "one hundred eighty-nine million, seven hundred forty-eight thousand, nine hundred seven".