Properties of the Number 423

Four Hundred Twenty-Three

Basics

Value: 422 → 423 → 424

Parity: odd

Prime: No

Previous Prime: 421

Next Prime: 431

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 47

Divisors: 1, 3, 9, 47, 141, 423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110100111

Octal: 647

Duodecimal: 2B3

Hexadecimal: 1a7

Square: 178929

Square Root: 20.566963801203133

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

Toothpick sequence (see Comments lines for definition). A139250

Generalized Catalan numbers: a(n+1) = a(n) + ∑_k=1..n-1 a(k)*a(n-1-k). A4148

Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=0, a(1)=1, a(2)=0. A1590

Multiples of 9: a(n) = 9·n. A8591

Numbers which are the product of a prime and the square of a different prime (p² * q). A54753

Number of elements in the set {(x,y): 1 <= x,y <= n, gcd(x,y)=1}. A18805

Lesser of two consecutive numbers each divisible by a square. A68781

Numbers of the form k + reverse(k) for at least one k. A67030

Numbers k such that k² + 2 is prime. A67201

a(n) = largest number of distinct words arising in Post's tag system {00, 1101} applied to a binary word w, over all starting words w of length n, or a(n) = -1 if there is a word w with an unbounded trajectory. A284116