189834391 has 2 divisors, whose sum is σ = 189834392. Its totient is φ = 189834390.

The previous prime is 189834389. The next prime is 189834401. The reversal of 189834391 is 193438981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189834391 - 2¹ = 189834389 is a prime.

Together with 189834389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189834311) 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, 94917195 + 94917196.

It is an arithmetic number, because the mean of its divisors is an integer number (94917196).

Almost surely, 2^189834391 is an apocalyptic number.

189834391 is a deficient number, since it is larger than the sum of its proper divisors (1).

189834391 is an equidigital number, since it uses as much as digits as its factorization.

189834391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 189834391 is about 13778.0401726806. The cubic root of 189834391 is about 574.7226296758.

The spelling of 189834391 in words is "one hundred eighty-nine million, eight hundred thirty-four thousand, three hundred ninety-one".