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Properties of the Number 19399

Nineteen Thousand Three Hundred Ninety-Nine

Basics

Value: 19398 → 19399 → 19400

Parity: odd

Prime: No

Previous Prime: 19391

Next Prime: 19403

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 19 × 1021

Divisors: 1, 19, 1021, 19399

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100101111000111

Octal: 45707

Duodecimal: B287

Hexadecimal: 4bc7

Square: 376321201

Square Root: 139.28029293478673

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

Number of partitions of n with odd minimal and maximal parts. A325338
Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0. A283886
a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2p+1 + 2 - n and p is the unique integer such that 2p < n - 1 <= 2p+1, starting with a(1) = a(2) = a(3) = 1. A49885
Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|=w+|y-z|. A212685
Number of partitions p of n such that (number of numbers in p of form 3k+2) > (number of numbers in p of form 3k). A241742
a(n) = numerator of ∑1 <= i < j <= d(n) 1/(dj - di), sum over ordered pairs of divisors of n, where d(n) is the number of divisors of n. A330077
Number of step cyclic shifted sequences using exactly two different symbols. A56415
Numbers k such that σ(φ(σ(k))) = σ(k). A66471
Primes with primitive root 76. A19399