Within the depth-psychology corpus, the numerological system occupies a contested but philosophically serious position, situated at the intersection of Jungian archetype theory, synchronicity, Pythagorean metaphysics, and cross-cultural divination practice. The central claim, advanced most rigorously by Marie-Louise von Franz and grounded in Jung’s own late speculations, is that natural integers are not merely quantitative abstractions but archetypal ordering principles — qualitatively distinct, numinously charged, and structurally prior to consciousness. Von Franz develops this thesis across multiple works, arguing that number constitutes the most primitive and irreducible manifestation of the archetype, one that bridges psyche and matter and underlies divinatory systems from the I Ching to Aztec calendrical theology. Jung himself, as reported by von Franz, recognized the individuality of each integer as psychologically significant, bequeathing this project to her unfinished. Edinger traces the genealogy to Pythagorean arithmos, where numbers were experienced as divine formative powers. Jodorowsky, writing from a tarot hermeneutics perspective, critically examines whether specific numerological schemes — ternary, quinary, decimal — genuinely inhere in the structure of the Minor Arcana, modeling a more discriminating application. The tension between numbers as universal archetypes and numbers as culturally constructed symbolic frameworks runs throughout the literature, unresolved but generative.