Properties of the Number 19988

Nineteen Thousand Nine Hundred Eighty-Eight

Basics

Value: 19987 → 19988 → 19989

Parity: even

Prime: No

Previous Prime: 19979

Next Prime: 19991

Digit Sum: 35

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 19 × 263

Divisors: 1, 2, 4, 19, 38, 76, 263, 526, 1052, 4997

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111000010100

Octal: 47024

Duodecimal: B698

Hexadecimal: 4e14

Square: 399520144

Square Root: 141.37892346456738

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

Expansion of ∏_{r = 1 or not a perfect power} 1/(1 - x^r). A305630

a(n) = 2·n*(7·n - 3). A316466

Array read by antidiagonals: T(m,n) = number of minimal edge covers in the grid graph P_m X P_n. A288025

Numbers k such that 2^k + k² - 1 is prime. A215439

a(n) = 1 + n*(n+1)*(n²-n+12)/12. A136396

a(n) = smallest multiple of 4 with sum of digits = n. A77489

Numerator of Hermite(n, 5/7). A159005

Numbers k such that A055228(k)² - A055228(k) is a multiple of k, where A055228(k) is ceiling(sqrt(k!)). A306014

Numbers k such that (10^k + 41)/3 is prime. A281493

Number of ways of embedding a connected graph with n edges in the square lattice. A19988