Properties of the Number 2807

Two Thousand Eight Hundred Seven

Basics

Value: 2806 → 2807 → 2808

Parity: odd

Prime: No

Previous Prime: 2803

Next Prime: 2819

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 401

Divisors: 1, 7, 401, 2807

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101011110111

Octal: 5367

Duodecimal: 175B

Hexadecimal: af7

Square: 7879249

Square Root: 52.98112871579842

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

Number of length n inversion sequences avoiding the patterns 110, 120, and 021. A279557

Number of multisets summing to n that are the first sums of some nonempty multiset. A390446

T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0, 1 or 2 neighboring 1s. A297374

∑_j>=1 jⁿ*2^j/binomial(2·j,j) = r_n*π/2 + s_n with integer r_n and s_n; sequence gives s_n. A180875

a(n) = prime(n)² - 2. A49001

a(n) = 4·n² + 4·n - 1. A73577

Numbers n such that n, n+2, n+4, n+6 are semiprimes. A92126

Numbers k such that k, k+2, k+4, k+6, k+8 are semiprimes. A92127

a(n) = 70·n - 63. A139264

Coefficients of the '6th-order' mock θ function σ(q). A53271