Properties of the Number 19402

Nineteen Thousand Four Hundred Two

Basics

Value: 19401 → 19402 → 19403

Parity: even

Prime: No

Previous Prime: 19391

Next Prime: 19403

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 89 × 109

Divisors: 1, 2, 89, 109, 178, 218, 9701, 19402

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101111001010

Octal: 45712

Duodecimal: B28A

Hexadecimal: 4bca

Square: 376437604

Square Root: 139.29106216839614

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

a(n) = 10·a(n-1) - a(n-2) with a(0) = 0, a(1) = 2. A1078

Integers that are Rhonda numbers to base 18. A255735

Denominators of continued fraction convergents to sqrt(6). A41007

Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0. A283886

Square root of floor(A055851(n)/6). A204519

Number T(n,k) of reduced decompositions for all permutations of [n] with exactly k inversions; triangle T(n,k), n>=0, 0<=k<=n*(n-1)/2, read by rows. A289778

Denominators of continued fraction convergents to sqrt(54). A41093

Expansion of (1-q)^k/∏_j=1..k (1-q^j) for k=12. A275643

G.f. satisfies: A(x) = 1 + ∑_n>=0 xⁿ * (1 - A(x)^2·n)/(1 - A(x)). A228907

Number of (6+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254912