Properties of the Number 1620

One Thousand Six Hundred Twenty

Basics

Value: 1619 → 1620 → 1621

Parity: even

Prime: No

Previous Prime: 1619

Next Prime: 1621

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ⁴ × 5

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11001010100

Octal: 3124

Duodecimal: B30

Hexadecimal: 654

Square: 2624400

Square Root: 40.24922359499622

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Highly abundant numbers: numbers k such that σ(k) > σ(m) for all m < k. A2093

a(n) = n*(4·n+1). A7742

Numbers that are divisible by exactly 7 primes counting multiplicity. A46308

Expansion of g.f. x*(1 + 3·x)/((1 + x)*(1 - x)³). A35608

a(n) = 5·n². A33429

Sums of twin prime pairs. A54735

Numbers k such that σ(k) > 3·k. A68403

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

Numbers with distinct prime factors 2, 3, and 5. A143207

Even triangular numbers halved. A74378