Properties of the Number 19995

Nineteen Thousand Nine Hundred Ninety-Five

Basics

Value: 19994 → 19995 → 19996

Parity: odd

Prime: No

Previous Prime: 19993

Next Prime: 19997

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 31 × 43

Divisors: 1, 3, 5, 15, 31, 43, 93, 129, 155, 215

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111000011011

Octal: 47033

Duodecimal: B6A3

Hexadecimal: 4e1b

Square: 399800025

Square Root: 141.40367746278736

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

Numbers k such that 3^k - 10 is prime. A217347

Smallest multiple of 5 with digit sum n. A69534

G.f.: 1/(1 - x/(1 - x³/(1 - x⁴/(1 - x⁷/(1 - x¹¹/(1 - x¹⁸/(1 -...- x^Lucas(n)/(1 -...)))))))), a continued fraction. A206742

Seventh partial sums of fifth powers (A000584). A254871

Number of multisets of nonempty words with a total of n letters over ternary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter. A293733

Array T(q,n) by antidiagonals: number of self-reciprocal polynomials of degree 2·n over GF(q) (for q >= 2 and n >= 1). A98691

Let p = first digit of n, q = number obtained if p is removed from n; let r = last digit of n, s = number obtained if r is removed from n; sequence give n such that p·q = r·s ≠ 0, p! = q, and r! = s. A245364

Numbers k such that the k-th triangular number contains only digits {0,1,9}. A119048

Number of n-bead necklaces of n colors allowing reversal, with no adjacent beads having the same color. A208538

Number of n-bead necklaces of 7 colors allowing reversal, with no adjacent beads having the same color. A208543