Finite Group DatabasebetaFinite Group DatabasebetaOrder 378.
16 conjugacy classes of subgroups.
| # | subgroup | G/H | class size | multiplicity | normal? | properties |
|---|---|---|---|---|---|---|
| 1 | C7×C27 | C2 | 1 | 1 | yes | maximal, characteristic, complemented, Hall |
| 2 | C9×D7 | C3 | 1 | 1 | yes | maximal, characteristic |
| 3 | C7×C9 | C2×C3 | 1 | 1 | yes | characteristic |
| 4 | C2×C27 | — | 7 | 1 | no | maximal, Hall |
| 5 | C3×D7 | C9 | 1 | 1 | yes | characteristic |
| 6 | C27 | D7 | 1 | 1 | yes | characteristic, direct product factor, Sylow |
| 7 | C3×C7 | C2×C9 | 1 | 1 | yes | characteristic |
| 8 | C2×C9 | — | 7 | 1 | no | — |
| 9 | D7 | C27 | 1 | 1 | yes | characteristic, direct product factor, Hall |
| 10 | C9 | C3×D7 | 1 | 1 | yes | characteristic |
| 11 | C7 | C2×C27 | 1 | 1 | yes | characteristic, complemented, Sylow |
| 12 | C2×C3 | — | 7 | 1 | no | — |
| 13 | C3 | C9×D7 | 1 | 1 | yes | characteristic |
| 14 | C2 | — | 7 | 1 | no | Sylow |
| subgroup | G/H | |
|---|---|---|
| center, hypercenter | C27 | D7 |
| commutator, hypocenter | C7 | C2×C27 |
| Frattini | C9 | C3×D7 |
| Fitting | C7×C27 | C2 |
| socle | C3×C7 | C2×C9 |
| prime radical | C3×D7 | C9 |
| cosocle | C7×C9 | C2×C3 |
| LCS | G ▷ C7 | |
| UCS | C1 ◁ C27 | |
Splittings G = N ⋊ H with N normal; H ≅ G/N.
| N | H ≅ G/N | type |
|---|---|---|
| 1. C7×C27 | C2 | semidirect |
| 6. C27 | D7 | direct (N × H) |
| 9. D7 | C27 | direct (N × H) |
| 11. C7 | C2×C27 | semidirect |
By isomorphism type — maximal subgroups of the same type appear once, whether or not they are normal.
| subgroup | index |
|---|---|
| C7×C27 | 2 |
| C9×D7 | 3 |
| C2×C27 | 7 |