Properties of the Number 18312

Eighteen Thousand Three Hundred Twelve

Basics

Value: 18311 → 18312 → 18313

Parity: even

Prime: No

Previous Prime: 18311

Next Prime: 18313

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 7 × 109

Divisors: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011110001000

Octal: 43610

Duodecimal: A720

Hexadecimal: 4788

Square: 335329344

Square Root: 135.32183859229818

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) = ∑_k=0..n binomial(n+3·k,k). A389239

Number of 7-digit numbers whose sum of digits is n. A278969

Irregular table read by rows: T(n,k) is the number of k-sided polygons formed, for k>=3, in a square when straight line segments connect the n+1 points along each edge that divide it into n equal parts to the n+1 points on the edge on the opposite side of the square. A355841

a(n) is the number of regions formed by n-secting the angles of a heptagon. A335757

E.g.f. satisfies A(x) = 1/(1 + A(x) * log(1 - x))³. A377446

Inverse permutation of A064364, when seen as flattened list. A257815

Practical numbers m with m-1 and m+1 both prime, and prime(m)-1 and prime(m)+1 both practical. A257922

Averages k of twin primes such that the sum (with multiplicity) of prime factors of k-1, k and k+1 is prime. A340060

E.g.f.: ∏_k>=1 1 / (1 - x^k)^tan(x/k). A347897

Rounded value of n·L_n(-1) where L is the Laguerre polynomial. A70070