189966943 has 2 divisors, whose sum is σ = 189966944. Its totient is φ = 189966942.

The previous prime is 189966929. The next prime is 189966949. The reversal of 189966943 is 349669981.

It is a strong prime.

It is an emirp because it is prime and its reverse (349669981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189966943 - 2⁵ = 189966911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189966949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94983471 + 94983472.

It is an arithmetic number, because the mean of its divisors is an integer number (94983472).

Almost surely, 2^189966943 is an apocalyptic number.

189966943 is a deficient number, since it is larger than the sum of its proper divisors (1).

189966943 is an equidigital number, since it uses as much as digits as its factorization.

189966943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The square root of 189966943 is about 13782.8495965094. The cubic root of 189966943 is about 574.8563653834.

The spelling of 189966943 in words is "one hundred eighty-nine million, nine hundred sixty-six thousand, nine hundred forty-three".