189947 has 2 divisors, whose sum is σ = 189948. Its totient is φ = 189946.

The previous prime is 189929. The next prime is 189949. The reversal of 189947 is 749981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189947 - 2⁸ = 189691 is a prime.

Together with 189949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189947.

It is not a weakly prime, because it can be changed into another prime (189949) by changing a digit.

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 as a sum of consecutive naturals, namely, 94973 + 94974.

It is an arithmetic number, because the mean of its divisors is an integer number (94974).

2¹⁸⁹⁹⁴⁷ is an apocalyptic number.

189947 is a deficient number, since it is larger than the sum of its proper divisors (1).

189947 is an equidigital number, since it uses as much as digits as its factorization.

189947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 189947 is about 435.8290949443. The cubic root of 189947 is about 57.4836248266.

It can be divided in two parts, 1899 and 47, that multiplied together give a triangular number (89253 = T₄₂₂).

The spelling of 189947 in words is "one hundred eighty-nine thousand, nine hundred forty-seven".