Properties of the Number 1428

One Thousand Four Hundred Twenty-Eight

Basics

Value: 1427 → 1428 → 1429

Parity: even

Prime: No

Previous Prime: 1427

Next Prime: 1429

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 7 × 17

Divisors: 1, 2, 3, 4, 6, 7, 12, 14, 17, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110010100

Octal: 2624

Duodecimal: 9B0

Hexadecimal: 594

Square: 2039184

Square Root: 37.78888725538237

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

a(n) = binomial(3·n,n)/(2·n+1) (enumerates ternary trees and also noncrossing trees). A1764

Average of twin prime pairs. A14574

If n = 2·m then a(n) = binomial(3·m, m)/(2·m+1), if n=2·m+1 then a(n) = binomial(3·m+1, m+1)/(2·m+1). A47749

Catalan numbers - 2 (A120304) with first three terms changed to 1,1,1. A289652

Related to number of mesh patterns of length 2 that avoid the pattern 321. A289654

Number of partitions of n containing a clique of size 1. A183558

Triangle of B-analogs of Stirling numbers of the second kind. A39755

Multiples of 14 containing a 14 in their decimal representation. A121034

Constant term in the reduction by (x² -> x+1) of the polynomial p(n,x) given in Comments. A192872

a(n) = a(n-1) + a(n - 1 - number of even terms so far). A6336