Properties of the Number 19447

Nineteen Thousand Four Hundred Forty-Seven

Basics

Value: 19446 → 19447 → 19448

Parity: odd

Prime: Yes

Previous Prime: 19441

Next Prime: 19457

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19447

Divisors: 1, 19447

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101111110111

Octal: 45767

Duodecimal: B307

Hexadecimal: 4bf7

Square: 378185809

Square Root: 139.45250087395348

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

Primes or negative values of primes in the sequence b(n) = 47·n² - 1701·n + 10181, n >= 0. A50267

Beginning with 3, least prime such that concatenation of first n terms and its digit reversal both are primes. A113584

Starting index of a string of exactly 5 consecutive equal digits in decimal expansion of π. A49521

Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime. A91365

Starting index of a string of 5 or more consecutive equal digits in decimal expansion of π. A49517

Starting index of a string of 4 or more consecutive equal digits in decimal expansion of π. A49516

Sum of binary numbers with n 1's and one (non-leading) 0. A59673

Primes for which the weight as defined in A117078 is 11 and the gap as defined in A001223 is 10. A119596

Primes p such that p-1 is squarefree and all prime divisors of p-1 other than 11 are also in the sequence. A267504

a(n) = number of nonempty subsets S of {1,2,...,n} such that (number of nonprimes in S) = (number of primes in S). A369854