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Properties of the Number 63840

Sixty-Three Thousand Eight Hundred Forty

Basics

Value: 63839 → 63840 → 63841

Parity: even

Prime: No

Previous Prime: 63839

Next Prime: 63841

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 5 × 3 × 5 × 7 × 19

Divisors: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111100101100000

Octal: 174540

Duodecimal: 30B40

Hexadecimal: f960

Square: 4075545600

Square Root: 252.6657871576601

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

Numbers j such that j and 2j are both between a pair of twin primes. A66388
a(n) is the number of partial bijections (or subpermutations) of an n-element set without fixed points (also called partial derangements). A144085
Triangle read by rows, T(n, k) = 4k*S4(n, k) where Sm(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0. A225467
T(n,k)=Number of nXk 0..2 arrays with no element equal to more than one of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A281540
Numbers with prime factorization pqrst5. A190383
Triangle read by rows: T(n,k) is the number of subpermutations of an n-set whose orbits are each of size at most k, and without fixed points. Equivalently, T(n,k) is the number of partial derangements of an n-set each of whose orbits is of size at most k. A261762
Integer areas A of integer-sided cyclic quadrilaterals such that the circumradius is of prime length. A230136
T(n,k) is the number of partial bijections (or subpermutations) of an n-element set with exactly k fixed points. A144088
a(n) = 18522·n - 10248. A157731
Numbers m such that exactly four subsets of {m-1, m, m+1} sum up to a prime number. A221310