Properties of the Number 1520

One Thousand Five Hundred Twenty

Basics

Value: 1519 → 1520 → 1521

Parity: even

Prime: No

Previous Prime: 1511

Next Prime: 1523

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 5 × 19

Divisors: 1, 2, 4, 5, 8, 10, 16, 19, 20, 38

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10111110000

Octal: 2760

Duodecimal: A68

Hexadecimal: 5f0

Square: 2310400

Square Root: 38.98717737923585

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Pentagonal numbers: a(n) = n*(3·n-1)/2. A326

a(n) = n*(n+2) = (n+1)² - 1. A5563

8 times triangular numbers: a(n) = 4·n*(n+1). A33996

Number of condensed integer partitions of n. A239312

Sub-perfect powers: perfect powers (squares, cubes etc., not including 1) minus 1. A45542

a(n) = (n-1)*n*(n+4)/6. A5581

Number of reduced words of length n in the Weyl group D₂₀. A162359

Ooguri-Vafa invariants of disk degeneracies for brane III in the O(K)->P¹ x P¹ geometry. A92698

Multiples of 20 containing a 20 in their decimal representation. A121040

a(n) = (prime(n)² - 1)/24. A24702