189745847 has 2 divisors, whose sum is σ = 189745848. Its totient is φ = 189745846.

The previous prime is 189745793. The next prime is 189745849. The reversal of 189745847 is 748547981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189745847 - 2²² = 185551543 is a prime.

Together with 189745849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189745849) 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 as a sum of consecutive naturals, namely, 94872923 + 94872924.

It is an arithmetic number, because the mean of its divisors is an integer number (94872924).

Almost surely, 2^189745847 is an apocalyptic number.

189745847 is a deficient number, since it is larger than the sum of its proper divisors (1).

189745847 is an equidigital number, since it uses as much as digits as its factorization.

189745847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 53.

The square root of 189745847 is about 13774.8265687812. The cubic root of 189745847 is about 574.6332602800.

The spelling of 189745847 in words is "one hundred eighty-nine million, seven hundred forty-five thousand, eight hundred forty-seven".