189405193 has 2 divisors, whose sum is σ = 189405194. Its totient is φ = 189405192.

The previous prime is 189405187. The next prime is 189405197. The reversal of 189405193 is 391504981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168272784 + 21132409 = 12972^2 + 4597^2 .

It is a cyclic number.

It is not a de Polignac number, because 189405193 - 2⁹ = 189404681 is a prime.

It is not a weakly prime, because it can be changed into another prime (189405197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94702596 + 94702597.

It is an arithmetic number, because the mean of its divisors is an integer number (94702597).

Almost surely, 2^189405193 is an apocalyptic number.

It is an amenable number.

189405193 is a deficient number, since it is larger than the sum of its proper divisors (1).

189405193 is an equidigital number, since it uses as much as digits as its factorization.

189405193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 189405193 is about 13762.4559218186. The cubic root of 189405193 is about 574.2891712721.

The spelling of 189405193 in words is "one hundred eighty-nine million, four hundred five thousand, one hundred ninety-three".