Properties of the Number 40081

Forty Thousand Eighty-One

Basics

Value: 40080 → 40081 → 40082

Parity: odd

Prime: No

Previous Prime: 40063

Next Prime: 40087

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 149 × 269

Divisors: 1, 149, 269, 40081

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001110010010001

Octal: 116221

Duodecimal: 1B241

Hexadecimal: 9c91

Square: 1606486561

Square Root: 200.2023975880409

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

Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1. A6145

Numbers k such that prime(k) == 7 (mod k). A23149

a(n) = T(n,n+2), where T = Delannoy triangle (A008288). A26002

Number triangle, equal to half of Delannoy square array A008288. A113139

Crystal ball sequence for 6-dimensional cubic lattice. A1848

Number of integer partitions of n whose length is a semi-sum of the parts. A367394

Riordan array (1/(1-x), x*(1+x)²/(1-x)²). A114123

Crystal ball sequence for 8-dimensional cubic lattice. A8417

Number triangle T(n,k) = [k<=n]*Hypergeometric2F1([-k, 2k-2n], [1], 2). A184883

Irregular triangle read by rows formed by taking every other row of the Delannoy array (A008288) regarded as a triangle. A297191