Properties of the Number 42128

Forty-Two Thousand One Hundred Twenty-Eight

Basics

Value: 42127 → 42128 → 42129

Parity: even

Prime: No

Previous Prime: 42101

Next Prime: 42131

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 2633

Divisors: 1, 2, 4, 8, 16, 2633, 5266, 10532, 21064, 42128

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010010010010000

Octal: 122220

Duodecimal: 20468

Hexadecimal: a490

Square: 1774768384

Square Root: 205.25106577068

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

S[A002808(n)] where S[] is Boris Stechkin's function (A055004) and A002808(n) are the composites. A63483

a(n) = (16-9·8ⁿ)/7. A165760

Triangle read by rows: T(n,k) (1 <= k <= n) given by T(n,1) = T(n,n) = 1, otherwise T(n,k) = (m·n-m·k+1)*T(n-1,k-1) + (m·k-m+1)*T(n-1,k), where m = -3. A392664

a(n) is the index of the first occurrence of the Euclidean distance prime(n) from a point on a square spiral to its starting point at 1. A336335

Numerators of continued fraction convergents to sqrt(589). A42128