Properties of the Number 19956

Nineteen Thousand Nine Hundred Fifty-Six

Basics

Value: 19955 → 19956 → 19957

Parity: even

Prime: No

Previous Prime: 19949

Next Prime: 19961

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 1663

Divisors: 1, 2, 3, 4, 6, 12, 1663, 3326, 4989, 6652

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111110100

Octal: 46764

Duodecimal: B670

Hexadecimal: 4df4

Square: 398241936

Square Root: 141.26570709128242

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

Number of graphical partitions of 2n. A569

Number of noncongruent integer-sided tetrahedra with largest side n. A97125

T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1s. A295040

Expansion of ∏_k>=1 1 / (1 - 2·x^k)². A266943

Expansion of ∑_k>=0 x^2·k/∏_j=1..k (1 - 3·j * x). A353262

Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1s. A295035

Number of nX6 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1s. A295038

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 94. A31592

Numbers having four 3's in base 9. A43468

a(n) = 4*(23 - 17·n + 8·n²). A387458