The quartonic comma is an interval of about 14.261 cents. It has the monzo [3 -18 11⟩ and the ratio 390625000 / 387420489.

Interval information
Factorization 23 × 3-18 × 511
Monzo [3 -18 11
Size in cents 14.26084¢
Name Quartonic comma
FJS name [math]\displaystyle{ \text{ddd}{-2}^{5,5,5,5,5,5,5,5,5,5,5} }[/math]
Special properties reduced
Tenney norm (log2 nd) 57.0705
Weil norm (log2 max(n, d)) 57.0824
Wilson norm (sopfr(nd)) 115
Comma size small
Open this interval in xen-calc

It defines the quartonic family of temperaments.