Properties of the Number 19978

Nineteen Thousand Nine Hundred Seventy-Eight

Basics

Value: 19977 → 19978 → 19979

Parity: even

Prime: No

Previous Prime: 19973

Next Prime: 19979

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 2 × 7 × 1427

Divisors: 1, 2, 7, 14, 1427, 2854, 9989, 19978

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111000001010

Octal: 47012

Duodecimal: B68A

Hexadecimal: 4e0a

Square: 399120484

Square Root: 141.34355308962628

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

Consider the 10's complements mod 10 of the digits of a number k. Take their sum and repeat the process deleting the first addend and adding the previous sum. The sequence lists the numbers that after some iterations reach a sum equal to k. A263534

Number of kites on an n X n grid (or geoboard). A189417

a(n) is the number of vertices formed by n-secting the angles of a heptagon. A335758

Number of partitions of n into at most 12 parts. A8641

Numbers k such that A090086(k), the smallest pseudoprime to base k (not necessarily exceeding k), is a Carmichael number. A293203

Molien series for alternating group Alt₁₂ (or A₁₂). A8635

Numbers k such that k!!!! - 1 is prime. A85147

Number of partitions of 3n in which every part is <n. A209817

Values of n such that prime(n) does not divide any 10-digit pandigital number (i.e. any value in A050278). A292703

Decimal expansion of tangent of 80 degrees. A19978