Properties of the Number 12788

Twelve Thousand Seven Hundred Eighty-Eight

Basics

Value: 12787 → 12788 → 12789

Parity: even

Prime: No

Previous Prime: 12781

Next Prime: 12791

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 23 × 139

Divisors: 1, 2, 4, 23, 46, 92, 139, 278, 556, 3197

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000111110100

Octal: 30764

Duodecimal: 7498

Hexadecimal: 31f4

Square: 163532944

Square Root: 113.08403954581743

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

Triangle read by rows: T(n,k) = number of edges in a "frame" of size n X k (see Comments in A331457 for definition). A332600

a(n) = first term that can be reduced in n steps via repeated interpretation of a(n) as a base b+1 number where b is the largest digit of a(n), such that b is always 8 so that each interpretation is base 9. Terms already fully reduced (i.e., single digits) are excluded. A141842

Expansion of ∏_k>=0 1/(1 - x^3·k+1)². A261616

Largest member of the n-th row of the triangular triangle (A093445). A93446

3-comma numbers: n occurs in the sequence S[k+1]=S[k]+10·last_digit(S[k-1])+first_digit(S[k]) for three different splittings n=concat(S[0],S[1]). A166513

a(n) = ∑_{-n<i<n, -n<j<n, gcd{i,j}=1} (n-|i|)*(n-|j|). A331771

a(n) = 10000·log₁₀(n) rounded up. A4230

a(0) = 0, a(1) = a(2) = 1, a(3) = 2, a(4) = 4, a(5) = 8, for n>4: a(n+1) = SORT[ a(n) + a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5)], where SORT places digits in ascending order and deletes 0's. A108566

a(n) = 441·n - 1. A158319

Number of compositions of n having exactly ten fixed points. A240745