Properties of the Number 38781

Thirty-Eight Thousand Seven Hundred Eighty-One

Basics

Value: 38780 → 38781 → 38782

Parity: odd

Prime: No

Previous Prime: 38767

Next Prime: 38783

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 31 × 139

Divisors: 1, 3, 9, 31, 93, 139, 279, 417, 1251, 4309

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001011101111101

Octal: 113575

Duodecimal: 1A539

Hexadecimal: 977d

Square: 1503965961

Square Root: 196.9289211873157

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

Structured hexagonal diamond numbers (vertex structure 5). A100178

Triangular numbers with property that digits alternate in parity. A68882

a(n) = larger member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers. A185128

Coefficients of x/(1-3·x-3·x²-x³). A108368

Third row of Pascal-(1,6,1) array A081581. A81591

Triangular numbers t such that t+10 is a prime. A129755

a(1) = 0, then smallest triangular number such that a(n+1)- a(n) is a palindrome. A75057

Triangular numbers for which the sum of the digits is a cube. A117803

(1/8)*number of lattice points with odd indices in a cubic lattice inside a sphere around the origin with radius 2·n. A120884

Triangular numbers of the form 2p-1 where p is prime. A217000