189761784907 has 4 divisors (see below), whose sum is σ = 189774064440. Its totient is φ = 189749505376.

The previous prime is 189761784887. The next prime is 189761784977. The reversal of 189761784907 is 709487167981.

189761784907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189761784907 is a prime.

It is a super-2 number, since 2×189761784907² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189761784977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6116557 + ... + 6147502.

It is an arithmetic number, because the mean of its divisors is an integer number (47443516110).

Almost surely, 2^189761784907 is an apocalyptic number.

189761784907 is a deficient number, since it is larger than the sum of its proper divisors (12279533).

189761784907 is a wasteful number, since it uses less digits than its factorization.

189761784907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12279532.

The product of its (nonzero) digits is 42674688, while the sum is 67.

The spelling of 189761784907 in words is "one hundred eighty-nine billion, seven hundred sixty-one million, seven hundred eighty-four thousand, nine hundred seven".