Properties of the Number 68839

Sixty-Eight Thousand Eight Hundred Thirty-Nine

Basics

Value: 68838 → 68839 → 68840

Parity: odd

Prime: No

Previous Prime: 68821

Next Prime: 68863

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 23 × 41 × 73

Divisors: 1, 23, 41, 73, 943, 1679, 2993, 68839

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: 10000110011100111

Octal: 206347

Duodecimal: 33A07

Hexadecimal: 10ce7

Square: 4738807921

Square Root: 262.3718734925678

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal. A236746

a(n) = n³ - 2·n. A242135

a(n) = n*(6·n² - 8·n + 3). A272378

Squarefree n such that the elliptic curve n·y² = x³ - x arising in the "congruent number" problem has rank 3 and nontrivial SHA[2]. A62694

Number of 5-element subsets of [n] having a prime element sum. A320680

Number of (n+1)X(3+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal. A236741

Numbers whose septenary, octal and nonary representations are prime when read in decimal. A281252

Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal. A236738

Smallest prime that ends with the right concatenation of first n odd numbers. A68839

Number of 7Xn 0..1 arrays with rows and antidiagonals unimodal. A223685