Properties of the Number 1912

One Thousand Nine Hundred Twelve

Basics

Value: 1911 → 1912 → 1913

Parity: even

Prime: No

Previous Prime: 1907

Next Prime: 1913

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 239

Divisors: 1, 2, 4, 8, 239, 478, 956, 1912

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11101111000

Octal: 3570

Duodecimal: 1134

Hexadecimal: 778

Square: 3655744

Square Root: 43.726422218150894

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) = 4·a(n-1) - 2·a(n-2) with a(0) = 1, a(1) = 4. A7070

Irregular triangular array T read by rows: T(n,0) = 1 for i >= 0, T(1,1) = 1,T(2,1) = 1, T(2,2) = 2, T(2,3) = 1, T(2,4) = 1 and for n >= 3, T(n,1) = n-1, T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k) for k=2,...,n+1, and T(n, k+2) = T(n-1, k) + T(n-1, k+1). A26148

Number of unimodal functions [1..n]->[0..2]. A223718

Number of integer partitions of n whose parts all have the same number of prime factors, counted with multiplicity. A319169

Number of non-isomorphic connected set-systems covering n vertices. A323819

Positive integers n such that n¹⁷ + 1 is semiprime (A001358). A104494

Number of integer partitions of n whose sequence of multiplicities is a palindrome. A317085

a(n) = a(n-1) + (3+(-1)ⁿ)*a(n-2)/2. A7068

a(n) = ∑_{k=0..floor(n/2)} T(n,k), T given by A026769. A26777

Numbers k such that φ(x) = k has exactly 6 solutions. A60669