189834389 has 2 divisors, whose sum is σ = 189834390. Its totient is φ = 189834388.

The previous prime is 189834361. The next prime is 189834391. The reversal of 189834389 is 983438981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179962225 + 9872164 = 13415^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 189834389 - 2⁸ = 189834133 is a prime.

Together with 189834391, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 189834389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189834349) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94917194 + 94917195.

It is an arithmetic number, because the mean of its divisors is an integer number (94917195).

Almost surely, 2^189834389 is an apocalyptic number.

It is an amenable number.

189834389 is a deficient number, since it is larger than the sum of its proper divisors (1).

189834389 is an equidigital number, since it uses as much as digits as its factorization.

189834389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 53.

The square root of 189834389 is about 13778.0401001013. The cubic root of 189834389 is about 574.7226276575.

The spelling of 189834389 in words is "one hundred eighty-nine million, eight hundred thirty-four thousand, three hundred eighty-nine".