Properties of the Number 18400

Eighteen Thousand Four Hundred

Basics

Value: 18399 → 18400 → 18401

Parity: even

Prime: No

Previous Prime: 18397

Next Prime: 18401

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁵ × 5 ² × 23

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 23, 25

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011111100000

Octal: 43740

Duodecimal: A794

Hexadecimal: 47e0

Square: 338560000

Square Root: 135.64659966250537

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

If X₁, ..., X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 3-subsets of X containing none of X_i, (i=1,...,n). A130809

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7. A251876

Numbers n such that the decimal number concat(5,n) is a square. A273360

Numbers p⁵*q²*r where p, q, r are 3 distinct primes. A179691

Numbers with an equal number of deficient and abundant divisors. A335543

Numbers that define integer Heronian triangles [prime(a(n)), prime(a(n)+1), A068965(n)] with area A068966(n). A68964

Wiener index of the n-sunlet graph. A180574

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 2·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 + x². A368156

Expansion of (∑_n=-inf..inf x^n²)^-23. A4424

Number of Carmichael numbers (A002997) less than 2ⁿ. A225005