HTC One A9 has a pixel density of:
440.58

A.K.A.
Released: 2015

Resolution: 1920×1080 5″ display

Full HD (FHD) 1920×1080, 16:9 aspect ratio

Totaling mp (megapixels) and having a PPI of 440.58

Category: Phone
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HTC One A9

Codename	Aero[1]
Manufacturer	HTC
Slogan	Be Brilliant
Series	HTC One
Model	A9
Predecessor	HTC One Mini 2
Type	Smartphone
Form factor	Slate
Dimensions	145.75 mm (5.738 in) H 70.8 mm (2.79 in) W 7.26 mm (0.286 in) D
Mass	143 g (5.0 oz)
Operating system	Original: Android “Marshmallow” 6.0 Current: Android “Nougat” 7.0, released in April 2017 Unofficial: Android 12 via LineageOS
System on chip	Qualcomm Snapdragon 617
CPU	Octa-core ARM 64-bit 1.5 GHz
GPU	Adreno 405 OpenGL ES 3.1
Memory	2 GB or 3 GB LPDDR4 RAM
Storage	16 GB or 32 GB
Removable storage	microSD up to 2 TB
Battery	2150 mAh Li-Po
Display	5.0 in (130 mm) Super AMOLED 1920 x 1080 pixels (16:9 Aspect ratio) (440 ppi) 2.5D Corning Gorilla Glass 4.0
Rear camera	13 MP with autofocus, dual-LED dual tone flash, ƒ/2.0 aperture, optical image stabilization, BSI 1080p video recording
Front camera	4 MP, UltraPixel fixed-focus camera, ƒ/2.0 aperture 1080p video recording
Connectivity	List Wi-Fi 802.11a/b/g/n/ac (2.4/5GHz) Wi-Fi Direct Wi-Fi hotspot Infrared DLNA GPS/GLONASS NFC Bluetooth USB (Micro-B port, USB charging) MHL USB OTG 3.5 millimetres (0.14 in) headphone jack
Data inputs	List Accelerometer Gesture sensor Gyroscope fingerprint sensor

This righthand infobox courtesy of Wikipedia.