Properties of the Number 19817

Nineteen Thousand Eight Hundred Seventeen

Basics

Value: 19816 → 19817 → 19818

Parity: odd

Prime: No

Previous Prime: 19813

Next Prime: 19819

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 7 × 19 × 149

Divisors: 1, 7, 19, 133, 149, 1043, 2831, 19817

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110101101001

Octal: 46551

Duodecimal: B575

Hexadecimal: 4d69

Square: 392713489

Square Root: 140.77286670377924

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 integer partitions of n with a difference < -1 and a conjugate difference < -1. A350839

All 81 combinations of prefixing and following a(n) by a single digit are nonprime. A32734

Numbers n such that φ(2n-1) = σ(n). A67230

The sum of the numbers on the perimeter of the n X n diamond frame, located at the top of the numerical pyramid containing the positive integers in natural order. A359096

Decimal expansion of sine of 8 degrees. A19817

Partial sums of A111939 (= number of primes < semiprime(n)). A122489

a(n) = (4·n² - 1)³. A69076