189881207 has 2 divisors, whose sum is σ = 189881208. Its totient is φ = 189881206.

The previous prime is 189881191. The next prime is 189881213. The reversal of 189881207 is 702188981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189881207 - 2⁴ = 189881191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189881267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94940603 + 94940604.

It is an arithmetic number, because the mean of its divisors is an integer number (94940604).

Almost surely, 2^189881207 is an apocalyptic number.

189881207 is a deficient number, since it is larger than the sum of its proper divisors (1).

189881207 is an equidigital number, since it uses as much as digits as its factorization.

189881207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 189881207 is about 13779.7390033338. The cubic root of 189881207 is about 574.7698708579.

The spelling of 189881207 in words is "one hundred eighty-nine million, eight hundred eighty-one thousand, two hundred seven".