For the reaction P $\to$ B, the values of frequency factor A and activation energy E_A are 4 $\times$ 10¹³ s^$-$1 and 8.3 kJ mol^$-$1 respectively. If the reaction is of first order, the temperature at which the rate constant is 2 $\times$ 10^$-$6 s^$-$1 is _____________ $\times$ 10^$-$1 K.

(Given : ln 10 = 2.3, R = 8.3 J K^$-$1 mol^$-$1, log2 = 0.30)