There is nothing magical about an AK-47; it has certain features that makes it fairly dependable even in adverse conditions.
With any bullet, fired from any weapon, the location of the impact, the size of the bullet, its velocity will all play a role with respect to injury severity.
Generally, a shot to the head, heart or major blood vessel will be fatal most of the time. However there are rarely exceptions. If the bullet impacts the torso (neck, chest, abdomen) it all depends what structures are damaged. There are many major organs in the torso and they have a blood supply, so such a wound would be life-threatening, but not 100% fatal. An AK-47 could hit a person in the upper chest, near the shoulder and pass through without hitting any major organ or blood vessel should not be fatal. A shot to the limbs (arm or leg) that hits the brachial or femoral artery will have a narrow window of opportunity for a medic to apply a tourniquet. Otherwise you'd be dealing with bone & tissue damage--maybe requiring an amputation.
The same could be said of a small, .22LR bullet as well. Shot placement has everything to do with survival.
7.62x39mm
7.62x39
The AK-47 shoots a 7.62 x 39mm bullet. The 39mm indicated the length of the brass/steel case.
The AK-47 uses the 7.62x39mm round. Note that the AK-74, a similar firearm uses the different 5.45x29mm round.
7.62×39mm
In the 2000-2200 fps range.
Best left to a gunsmith
one hundred and twenty three pounds
1776mph over 2000fps
Very small trees.
The AK-47 and AKM use the 7.62x39 cartridge.
The cartridge is 7.62mm x 39mm long.