What does 'compute capability' mean w.r.t. CUDA?

I am new to CUDA programming and don't know much about it. Can you please tell me what does 'CUDA compute capability' mean? When I use the following code on my university server, it showed me the following result.

for (device = 0; device < deviceCount; ++device) 
{ 
    cudaDeviceProp deviceProp; 
    cudaGetDeviceProperties(&deviceProp, device); 
    printf("\nDevice %d has compute capability %d.%d.\n", device, deviceProp.major, deviceProp.minor);      
}

RESULT:

Device 0 has compute capability 4199672.0.
Device 1 has compute capability 4199672.0.
Device 2 has compute capability 4199672.0.
.
.

cudaGetDeviceProperties returns two fields major and minor. Can you please tell me what is this 4199672.0. means?