189439213 has 2 divisors, whose sum is σ = 189439214. Its totient is φ = 189439212.

The previous prime is 189439207. The next prime is 189439267. The reversal of 189439213 is 312934981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189420169 + 19044 = 13763^2 + 138^2 .

It is an emirp because it is prime and its reverse (312934981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189439213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189439273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94719606 + 94719607.

It is an arithmetic number, because the mean of its divisors is an integer number (94719607).

Almost surely, 2^189439213 is an apocalyptic number.

It is an amenable number.

189439213 is a deficient number, since it is larger than the sum of its proper divisors (1).

189439213 is an equidigital number, since it uses as much as digits as its factorization.

189439213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 189439213 is about 13763.6918375849. The cubic root of 189439213 is about 574.3235528496.

The spelling of 189439213 in words is "one hundred eighty-nine million, four hundred thirty-nine thousand, two hundred thirteen".