Properties of the Number 8440

Eight Thousand Four Hundred Forty

Basics

Value: 8439 → 8440 → 8441

Parity: even

Prime: No

Previous Prime: 8431

Next Prime: 8443

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 5 × 211

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 211, 422

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10000011111000

Octal: 20370

Duodecimal: 4A74

Hexadecimal: 20f8

Square: 71233600

Square Root: 91.86947262284681

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

Numbers k such that π(k) divides k. A57809

Truncated square pyramid numbers: a(n) = ∑_{k = n..2·n} k². A50409

T(n,k)=Number of length n+3 0..k arrays with some disjoint pairs in every consecutive four terms having the same sum. A247533

A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the ratios of three complementary pairs of simple musical tones: 7/6 and 12/7, 6/5 and 5/3 and 7/5 and 10/7. A60529

Binomial transform of A048654: generalized Pellian with second term equal to 4. A111567

Number of 2-linear trees on n nodes. A338706

Number of primes between successive Lucas numbers. A52012

a(n) = ∑_{k=0..floor(n/2)} (n-k)². A129371

Fourier coefficients of E_γ,2*E_0,4. A35036

Absolute value of difference between counts of uninterrupted runs of 2 primes in A092639 and A092640. A92641