Properties of the Number 19649

Nineteen Thousand Six Hundred Forty-Nine

Basics

Value: 19648 → 19649 → 19650

Parity: odd

Prime: No

Previous Prime: 19609

Next Prime: 19661

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 7 ² × 401

Divisors: 1, 7, 49, 401, 2807, 19649

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100110011000001

Octal: 46301

Duodecimal: B455

Hexadecimal: 4cc1

Square: 386083201

Square Root: 140.1748907615055

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

Centered octahedral numbers (crystal ball sequence for cubic lattice). A1845

Numbers n such that sopf(n) = sopf(n-1) + sopf(n-2), where sopf(x) = sum of the distinct prime factors of x. A75565

Numbers that are the sum of seven fifth powers in two or more ways. A345605

Numbers that are the sum of seven fifth powers in exactly two ways. A346279

a(n) = 3ⁿ - Fibonacci(n). A212323

Number of partitions of n such that the (sum of distinct odd parts) > n/2. A284614

a(n) is the smallest number k such that 2k - σ(k) = 2ⁿ. A292557

Indices of primes in sequence defined by A(0) = 39, A(n) = 10·A(n-1) - 61 for n > 0. A101831

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 662", based on the 5-celled von Neumann neighborhood. A273390

Numbers n such that the n-th Lucas number is prime and can be written in the form a² + 7·b². A216537