185428189 has 2 divisors, whose sum is σ = 185428190. Its totient is φ = 185428188.

The previous prime is 185428153. The next prime is 185428193. The reversal of 185428189 is 981824581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141205689 + 44222500 = 11883^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 185428189 - 2¹⁷ = 185297117 is a prime.

It is a super-2 number, since 2×185428189² = 68767226551639442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185428289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92714094 + 92714095.

It is an arithmetic number, because the mean of its divisors is an integer number (92714095).

Almost surely, 2^185428189 is an apocalyptic number.

It is an amenable number.

185428189 is a deficient number, since it is larger than the sum of its proper divisors (1).

185428189 is an equidigital number, since it uses as much as digits as its factorization.

185428189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 46.

The square root of 185428189 is about 13617.2019519430. The cubic root of 185428189 is about 570.2411916584.

The spelling of 185428189 in words is "one hundred eighty-five million, four hundred twenty-eight thousand, one hundred eighty-nine".