189890227 has 2 divisors, whose sum is σ = 189890228. Its totient is φ = 189890226.

The previous prime is 189890171. The next prime is 189890243. The reversal of 189890227 is 722098981.

It is a strong prime.

It is an emirp because it is prime and its reverse (722098981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189890227 is a prime.

It is a super-2 number, since 2×189890227² = 72116596620223058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189890257) 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, 94945113 + 94945114.

It is an arithmetic number, because the mean of its divisors is an integer number (94945114).

Almost surely, 2^189890227 is an apocalyptic number.

189890227 is a deficient number, since it is larger than the sum of its proper divisors (1).

189890227 is an equidigital number, since it uses as much as digits as its factorization.

189890227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 189890227 is about 13780.0662915677. The cubic root of 189890227 is about 574.7789718852.

The spelling of 189890227 in words is "one hundred eighty-nine million, eight hundred ninety thousand, two hundred twenty-seven".