Properties of the Number 19807

Nineteen Thousand Eight Hundred Seven

Basics

Value: 19806 → 19807 → 19808

Parity: odd

Prime: No

Previous Prime: 19801

Next Prime: 19813

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 29 × 683

Divisors: 1, 29, 683, 19807

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101011111

Octal: 46537

Duodecimal: B567

Hexadecimal: 4d5f

Square: 392317249

Square Root: 140.7373440135915

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 distinct lines through the origin in 3-dimensional cube of side length n. A90025

Numbers in ascending order formed by using all the digits of the next n numbers. A81991

Total number of inversions in all partitions of n into distinct parts. A271371

Odd numbers k such that the palindromic wing number (a.k.a. near-repdigit palindrome) 7*(10^k - 1)/9 - 2·10^(k-1/2) is prime. A77785

Number of length n+4 0..7 arrays with no five consecutive elements with pattern ababa or abbba (with a≠b) and new values 0..7 introduced in 0..7 order. A244699

Number of base 27 circular n-digit numbers with adjacent digits differing by 5 or less. A125390

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 1), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}. A148080

T(n,k)=Number of length n+4 0..k arrays with no five consecutive elements with pattern ababa or abbba (with a≠b) and new values 0..k introduced in 0..k order. A244702

a(n) = sum of numbers formed using the digits of next n numbers. A81993

Decimal expansion of sqrt(2·e)/19. A19807