Properties of the Number 40721

Forty Thousand Seven Hundred Twenty-One

Basics

Value: 40720 → 40721 → 40722

Parity: odd

Prime: No

Previous Prime: 40709

Next Prime: 40739

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 43 × 947

Divisors: 1, 43, 947, 40721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1001111100010001

Octal: 117421

Duodecimal: 1B695

Hexadecimal: 9f11

Square: 1658199841

Square Root: 201.79444987412316

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

Composite and every divisor (except 1) contains the digit 4. A62670

Total number of parts that are the smallest part or the largest part in all partitions of n. A182978

a(n) = 6·binomial(n,4) + 3·binomial(n,3) + 4·binomial(n,2) - n + 2. A66375

Reversion of g.f. for Euler (secant) numbers A000364. A7313

Upper bound on number of regular triangulations of cyclic polytope C(n, n-4). A66456

Number of trees on n nodes with forbidden limbs. A14272

Incorrect version of A159772. A161898

Continued fraction for sqrt(749). A40721