ℕ atory
Play Now

Properties of the Number 76840

Seventy-Six Thousand Eight Hundred Forty

Basics

Value: 76839 → 76840 → 76841

Parity: even

Prime: No

Previous Prime: 76837

Next Prime: 76847

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 3 × 5 × 17 × 113

Divisors: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10010110000101000

Octal: 226050

Duodecimal: 38574

Hexadecimal: 12c28

Square: 5904385600

Square Root: 277.2002886001384

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

a(n) = (2·n-1)*(n2 -n +2)/2. A63488
Triangle read by rows: T(n,k) is the number of permutations of [n] having k-1 alternating descents (1<=k<=n). The index i is an alternating descent of a permutation p if either i is odd and p(i)>p(i+1), or i is even and p(i)<p(i+1). A145876
Number of partitions of n having no parts with multiplicity 3. A118807
T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically. A253367
Number of permutations of [n] having exactly ceiling(n/2)-1 alternating descents. A302905
Numbers k such that A011772(k) > A344878(k) and A011772(k) is a divisor of A344875(k). A344595
Number of permutations of [2n+1] having exactly n alternating descents. A302903
Number of permutations of [n] having exactly four alternating descents. A302897
a(n) = number of digits in the decimal expansion of A046967(n). A135250
Number of (n+2)X(n+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically. A253359