Properties of the Number 69876

Sixty-Nine Thousand Eight Hundred Seventy-Six

Basics

Value: 69875 → 69876 → 69877

Parity: even

Prime: No

Previous Prime: 69859

Next Prime: 69877

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ³ × 647

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001000011110100

Octal: 210364

Duodecimal: 34530

Hexadecimal: 110f4

Square: 4882655376

Square Root: 264.34068926292827

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

Pentagonal numbers > 0 which are not the difference of two larger pentagonal numbers. A136113

Pentagonal numbers > 0 which are not the difference of two other pentagonal numbers > 0. A135769

Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,55. A65696

Pentagonal numbers (A000326) in which parity of digits alternates. A297644

Riordan array (1/(1-2x), x(1-x)/(1-2x)²). A114164

Values of n such that N=(an+1)(bn+1)(cn+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,33. A64253

Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2. A211911

Pentagonal numbers not divisible by 10 whose reverse is triangular. A66757

a(n) = (k-n+1)ⁿ + (k-n+2)ⁿ + ... + (k-1)ⁿ + kⁿ, where k = n(n+1)/2. A69876