Properties of the Number 18649

Eighteen Thousand Six Hundred Forty-Nine

Basics

Value: 18648 → 18649 → 18650

Parity: odd

Prime: No

Previous Prime: 18637

Next Prime: 18661

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 17 × 1097

Divisors: 1, 17, 1097, 18649

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011011001

Octal: 44331

Duodecimal: A961

Hexadecimal: 48d9

Square: 347785201

Square Root: 136.56134152826706

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

Centered 28-gonal numbers. A195314

Consider the Diophantine equation x³ + y³ = z³ - 1 (0 < x < y < z) or 'Fermat near misses'. Arrange solutions by increasing values of z. Sequence gives values of z. A50787

Numerators of terms in series expansion of arcsin(arctan(x)). A96717

Smallest nonprime number which if used as initial term for iteration of the A000010[x] function, results in list-to-fixed-point of length=n, or 0 if no such number exists. A98196

Expansion of e.g.f. arcsinh(arctanh(x)) (odd powers only). A296679

a(n) = greatest k such that A155043(k+A262509(n)) < A155043(A262509(n)). A262909

a(n) = (27·n² + 9·n + 2)/2. A93485

Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways. A180089

Number of 7-element subsets of {1, 2, ..., n} having pairwise coprime elements. A186983

Principal diagonal of the convolution array A213831. A213832