189984947 has 2 divisors, whose sum is σ = 189984948. Its totient is φ = 189984946.

The previous prime is 189984941. The next prime is 189984997. The reversal of 189984947 is 749489981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189984947 - 2⁴ = 189984931 is a prime.

It is not a weakly prime, because it can be changed into another prime (189984941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94992473 + 94992474.

It is an arithmetic number, because the mean of its divisors is an integer number (94992474).

Almost surely, 2^189984947 is an apocalyptic number.

189984947 is a deficient number, since it is larger than the sum of its proper divisors (1).

189984947 is an equidigital number, since it uses as much as digits as its factorization.

189984947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 189984947 is about 13783.5027115752. The cubic root of 189984947 is about 574.8745253623.

The spelling of 189984947 in words is "one hundred eighty-nine million, nine hundred eighty-four thousand, nine hundred forty-seven".