Properties of the Number 74209

Seventy-Four Thousand Two Hundred Nine

Basics

Value: 74208 → 74209 → 74210

Parity: odd

Prime: Yes

Previous Prime: 74203

Next Prime: 74219

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 74209

Divisors: 1, 74209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10010000111100001

Octal: 220741

Duodecimal: 36B41

Hexadecimal: 121e1

Square: 5506975681

Square Root: 272.4132889563209

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

Primes p such that A001175(p) = (p-1)/8. A308793

Primes p such that the decimal expansion of p remains prime under two iterations of base-10 to base-2 conversions. A123266

Scale factor by which primitive Pythagorean triangle {x=A088509(n), y=A088510(n), z=A088511(n)} needs be enlarged in order to circumscribe the smallest integral square having a side on the hypotenuse. A88544

Odd primes p with the property that gcd(ord_p q: prime q divides p-1) = 1. A295975

Third term of weak prime sextet: p(m-1)-p(m-2) < p(m)-p(m-1) < p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2). A54830

Primes of the form x² + 18480·y². A173274

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 36. A31624

a(n) = ∑_i=n+1..2n iⁿ. A74209