Properties of the Number 18861

Eighteen Thousand Eight Hundred Sixty-One

Basics

Value: 18860 → 18861 → 18862

Parity: odd

Prime: No

Previous Prime: 18859

Next Prime: 18869

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 6287

Divisors: 1, 3, 6287, 18861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100110101101

Octal: 44655

Duodecimal: AAB9

Hexadecimal: 49ad

Square: 355737321

Square Root: 137.33535597216036

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

Positive integers m such that π(m²) = π(j²) + π(k²) for no 0 < j <= k < m. A262408

Centered 23-gonal numbers. A69174

a(n) = ∑_i=0..n digsum₆(i)⁴, where digsum₆(i) = A053827(i). A231675

Number of parts in all partitions of 2n with largest multiplicity n. A320381

Number of maximal irredundant sets in the n-pan graph. A291102

a(n) = ∑_{k=1..floor(n/2)} k * (n-k) * floor((n-k)/k). A339804

a(n) is the number of squares strictly between Fibonacci(n) and Fibonacci(n+1). A350701

G.f. A(x) satisfies A(x) = ∑_k>=0 x^k * A(k²*x). A385543

Smallest power of 5 that begins with n. A18861

Number of n X 5 1..2 arrays containing at least one of each value, and all equal values connected. A166769