Properties of the Number 7870

Seven Thousand Eight Hundred Seventy

Basics

Value: 7869 → 7870 → 7871

Parity: even

Prime: No

Previous Prime: 7867

Next Prime: 7873

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 787

Divisors: 1, 2, 5, 10, 787, 1574, 3935, 7870

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111010111110

Octal: 17276

Duodecimal: 467A

Hexadecimal: 1ebe

Square: 61936900

Square Root: 88.7130204648675

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

Numbers n such that 4ⁿ+3^n-1 is prime. A93717

Second members D of two non-consecutive numbers such that the sums of their cubes are equal to centered cube numbers and to at least one other sum of two cubes, i.e., A = B³ + (B+1)³ = C³ + D³ = E³ + F³. A352223

T(n,k)=Number of nXk 0..1 arrays with no more than floor(nXk/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order. A222360

T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo n and the upper left element equal to 0. A267392

Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 8 sites wide. A58365

Triangle read by rows, T(n,k) = (2^k-1) * T(n-1,k) + T(n-1,k-1). A139382

The number of different classes of 2-dimensional convex lattice polytopes having volume n/2 up to unimodular equivalence. A187015

Denominators of continued fraction convergents to sqrt(545). A42043

Number of (3+1)X(n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250657

Expansion of (1/x) * Series_Reversion( x / ((1+x)² * (1+x²)) ). A369439