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Properties of the Number 19802

Nineteen Thousand Eight Hundred Two

Basics

Value: 19801 → 19802 → 19803

Parity: even

Prime: No

Previous Prime: 19801

Next Prime: 19813

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 9901

Divisors: 1, 2, 9901, 19802

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110101011010

Octal: 46532

Duodecimal: B562

Hexadecimal: 4d5a

Square: 392119204

Square Root: 140.71957930579526

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

T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences. A200454
Numbers k which when sandwiched between two 2's give a multiple of k. A116437
Numbers k which when sandwiched between two 4's give a multiple of k. A116439
Numbers k which when sandwiched between two 6's give a multiple of k. A116441
Numbers k which when sandwiched between two 8's give a multiple of k. A116443
Numbers n such that if p=prime(n), then p, p+6, p+12, p+18 are consecutive primes with p=6·k+5 for some k, where prime(n) denotes n-th prime. A90835
Eigensequence for the Moebius μ triangle A152904. A185694
Row sums of triangle A125653, in which column k equals the eigensequence of the matrix power A125653k. A125658
a(0)=0, a(1)=1; a(n) = n·a(n-1) + (n-2)*a(n-2) - ∑j=1..n-1 a(j)*a(n-j). A259870
Number of products of distinct factorials not exceeding n!. A101977