189639343 has 2 divisors, whose sum is σ = 189639344. Its totient is φ = 189639342.

The previous prime is 189639299. The next prime is 189639349. The reversal of 189639343 is 343936981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189639343 - 2⁹ = 189638831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189639293 and 189639302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189639349) 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, 94819671 + 94819672.

It is an arithmetic number, because the mean of its divisors is an integer number (94819672).

Almost surely, 2^189639343 is an apocalyptic number.

189639343 is a deficient number, since it is larger than the sum of its proper divisors (1).

189639343 is an equidigital number, since it uses as much as digits as its factorization.

189639343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 46.

The square root of 189639343 is about 13770.9601335564. The cubic root of 189639343 is about 574.5257266222.

The spelling of 189639343 in words is "one hundred eighty-nine million, six hundred thirty-nine thousand, three hundred forty-three".