6849

Digit 2 is twice of digit 3

2- 2468
3- 1234

digit 4 is one more than digit 2

2- 2468
3- 1234
4- 3579

digit 1 is 3 less than digit 4

1- 0246
2- 2468
3- 1234
4- 3579

so four possible solutions uptill now are 0213, 2425, 4637, 6849

digit 3 is not a prime number and is 1 more than 1/3 of digit 4
hence it is 6849

1- 0248
2- 2468
3- 1234
4- 3579