Unless you buy expensive things and living in a expensive apartment, that amount of money is totally enough for living in a Ulaanbaatar city.
Yes, that is true. if you plan not to buy expensive things, the salary is absolutely enough to live in UB.
You will have no problems about accomodation and food. Then what would be problem?
If the salary is good for you, I think you should come in Mongolia to save some money and gain your expat experience.
Good luck!