189434789 has 2 divisors, whose sum is σ = 189434790. Its totient is φ = 189434788.

The previous prime is 189434779. The next prime is 189434803. The reversal of 189434789 is 987434981.

189434789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186104164 + 3330625 = 13642^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 189434789 - 2⁸ = 189434533 is a 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 189434789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189434779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94717394 + 94717395.

It is an arithmetic number, because the mean of its divisors is an integer number (94717395).

Almost surely, 2^189434789 is an apocalyptic number.

It is an amenable number.

189434789 is a deficient number, since it is larger than the sum of its proper divisors (1).

189434789 is an equidigital number, since it uses as much as digits as its factorization.

189434789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 189434789 is about 13763.5311239522. The cubic root of 189434789 is about 574.3190820625.

It can be divided in two parts, 18943 and 4789, that added together give a palindrome (23732).

The spelling of 189434789 in words is "one hundred eighty-nine million, four hundred thirty-four thousand, seven hundred eighty-nine".