Properties of the Number 71985

Seventy-One Thousand Nine Hundred Eighty-Five

Basics

Value: 71984 → 71985 → 71986

Parity: odd

Prime: No

Previous Prime: 71983

Next Prime: 71987

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 4799

Divisors: 1, 3, 5, 15, 4799, 14397, 23995, 71985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001100100110001

Octal: 214461

Duodecimal: 357A9

Hexadecimal: 11931

Square: 5181840225

Square Root: 268.30020499433095

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

a(n) = ∑_{k=0..floor(n/2)} binomial(k+3,3) * binomial(k,n-2·k)². A377149

a(n) is the smallest positive integer that cannot be obtained using at most n-1 of the integers {1, 2, ..., n} using each number at most once and the operators +, -, *, /. A71985