193728089 has 2 divisors, whose sum is σ = 193728090. Its totient is φ = 193728088.

The previous prime is 193728077. The next prime is 193728121. The reversal of 193728089 is 980827391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163840000 + 29888089 = 12800^2 + 5467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193728089 is a prime.

It is not a weakly prime, because it can be changed into another prime (193728019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96864044 + 96864045.

It is an arithmetic number, because the mean of its divisors is an integer number (96864045).

Almost surely, 2^193728089 is an apocalyptic number.

It is an amenable number.

193728089 is a deficient number, since it is larger than the sum of its proper divisors (1).

193728089 is an equidigital number, since it uses as much as digits as its factorization.

193728089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 193728089 is about 13918.6238184671. The cubic root of 193728089 is about 578.6254499228.

The spelling of 193728089 in words is "one hundred ninety-three million, seven hundred twenty-eight thousand, eighty-nine".