Properties of the Number 1870

One Thousand Eight Hundred Seventy

Basics

Value: 1869 → 1870 → 1871

Parity: even

Prime: No

Previous Prime: 1867

Next Prime: 1871

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 11 × 17

Divisors: 1, 2, 5, 10, 11, 17, 22, 34, 55, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11101001110

Octal: 3516

Duodecimal: 10BA

Hexadecimal: 74e

Square: 3496900

Square Root: 43.243496620879306

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

The Golden Triangle: T(n,k) = A001654(k) for n>=0 and 0<=k<=n. A180662

10-gonal (or decagonal) numbers: a(n) = n*(4·n-3). A1107

Golden rectangle numbers: F(n) * F(n+1), where F(n) = A000045(n) (Fibonacci numbers). A1654

Generalized 10-gonal numbers: m*(4·m - 3) for m = 0, +- 1, +- 2, +- 3, ... A74377

Products of exactly four distinct primes. A46386

a(n) = a(n-1) + a(n-3) + a(n-4), a(0) = a(1) = a(2) = 1, a(3) = 2. A6498

Triangle of Fibonomial coefficients, read by rows. A10048

Primitive abundant numbers (abundant numbers all of whose proper divisors are deficient numbers). A71395

Generalized 11-gonal (or hendecagonal) numbers: m*(9·m - 7)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A195160

Expansion of g.f. x*(1 + 3·x)/((1 + x)*(1 - x)³). A35608