Properties of the Number 77421

Seventy-Seven Thousand Four Hundred Twenty-One

Basics

Value: 77420 → 77421 → 77422

Parity: odd

Prime: No

Previous Prime: 77419

Next Prime: 77431

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 131 × 197

Divisors: 1, 3, 131, 197, 393, 591, 25807, 77421

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010111001101101

Octal: 227155

Duodecimal: 38979

Hexadecimal: 12e6d

Square: 5994011241

Square Root: 278.2462937758561

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

Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2. A73873

a(n) is the least integer m such that A001006(m) is divisible by prime(n)² or -1 if no such m exists. A354293

Hexagonal numbers that are sphenic numbers. A380007

Strong pseudoprimes to base 61. A20287

Molien series for 16-dimensional group of structure 2⁴.O₄⁺(F₂) = 2⁴.(S₃ X S₃).2 and order 1152, corresponding to genus 2 complete weight enumerators of Hermitian self-dual GF(2)-linear codes over GF(4) containing the all-ones vector. A92203

Triangular numbers composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}. A247021

Triangular numbers T such that T+10 is the next prime after T. A129540

Greatest number m such that the fractional part of (4/3)^A154133(n) >= 1-(1/m). A154137

Chebyshev sequence U(n,11)=S(n,22) with Diophantine property. A77421