189437243 has 2 divisors, whose sum is σ = 189437244. Its totient is φ = 189437242.

The previous prime is 189437233. The next prime is 189437257. The reversal of 189437243 is 342734981.

It is a weak prime.

It is an emirp because it is prime and its reverse (342734981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189437243 - 2⁸ = 189436987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189437243.

It is not a weakly prime, because it can be changed into another prime (189437203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94718621 + 94718622.

It is an arithmetic number, because the mean of its divisors is an integer number (94718622).

Almost surely, 2^189437243 is an apocalyptic number.

189437243 is a deficient number, since it is larger than the sum of its proper divisors (1).

189437243 is an equidigital number, since it uses as much as digits as its factorization.

189437243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 189437243 is about 13763.6202722975. The cubic root of 189437243 is about 574.3215620240.

The spelling of 189437243 in words is "one hundred eighty-nine million, four hundred thirty-seven thousand, two hundred forty-three".