Properties of the Number 7740

Seven Thousand Seven Hundred Forty

Basics

Value: 7739 → 7740 → 7741

Parity: even

Prime: No

Previous Prime: 7727

Next Prime: 7741

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 5 × 43

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1111000111100

Octal: 17074

Duodecimal: 4590

Hexadecimal: 1e3c

Square: 59907600

Square Root: 87.97726979169109

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

Pentagonal numbers with even index. A49452

Numbers k such that φ(x) = k has exactly 10 solutions. A60673

Number of primes < square root of n!. A133228

Create the sequence of all positive integers > 1 that are prime or whose prime shadow (A181819) is a divisor that is already in the sequence. Then remove all the primes. A353389

Expansion of (1 / theta₄(x) - 1)⁹ / 512. A341370

Numbers of the form p²*q²*r·s where p, q, r, and s are distinct primes. A179690

Numbers that are the sum of nine fifth powers in two or more ways. A345619

Numbers that are the sum of nine fifth powers in exactly two ways. A346337

Even pentagonal numbers. A14633

a(n) = (2·n)² - 4. A134582